This PondSeal page has changed, please be aware there will no longer be small quantities offered and only large quantities as a request for quote for significant projects or tonnage. Please feel free to read on to learn more about pondseal and listen to the interview. If you have questions about a leaking pond and need help or ideas on how to fix it please use the contact page to let us know how we can help.

Help for your leaking pond is now easier than you could imagine… there is a new product on the block called PONDSEAL. Whether you have a leak in an existing pond basin or are installing a new waterway, PONDSEAL is there and ready to hold your water.

Not that its brand new but truth be told, the technology has been around (as AquaBlok®) for about 10 years now – but it has historically been used for a different reason . . .  to separate clean water from contaminated sediments. Additional formulations and smaller-unit packaging options have introduced a whole new way to fix a leaky pond or to seal areas of gravel, sand, or other porous materials while digging the pond.

Picture this… The pond is all finished, full of water, and you decide to put in a dock, deck, or duck house. Next thing you know the water level is going down because you just put a hole in the pond liner or through the clay liner. Sodium bentonite clay is a great solution and sealant, but how do you get this fine powder around those poles? The clay is a fine grained powder like baking soda or flour that clumps when it gets wet – so it’s often very difficult to place where you want it.

What if it was like sand where there is some weight behind it and you could easily distribute the material around those poles and know you are hitting the target area – not waiting for the powder to get wet and just hoping that it hits its mark?Leaky Pond

This is where PONDSEAL comes to the rescue. This innovative technology is simply a tiny rock reliably coated with high-grade, powdered sodium bentonite. Picture a peanut M&M with the peanut as the rock and the chocolate candy shell as the sodium bentonite. Due to the weight and structure of this “composite,” now you know when you place the bentonite clay through the water it is actually going where you want it – and need it.

A new pond building project with marginal soils (not up to par for water containment) offers many opportunities to use this product. As an example, when building a farm pond 10 feet deep, it would only take a layer of PONDSEAL one inch thick to seal the entire pond. That works out to about seven pounds of material per square foot.

Some of the other uses for PONDSEAL are to fill in muskrat holes, repair damage from rotted tree roots, patch a leak in a synthetic pond liner, reinforce control structures like overflows, or seal around pipe entering or exiting the basin as an anti seep collar. The material can make all of these projects a lot simpler.

Listen to the audio below, where Darrell Rhoades interviews Eric Kraus to learn more about PONDSEAL, what it is, what it does, and to hear more technical in-depth questions about the product.  Listen carefully to find out if your pond is leaking or if it is just evaporation. If you have a problem, see how simple PONDSEAL is to use. Click the play button to listen to the interview.

Please shoot us an email for a quote as shipping is a factor and to help determine amount you may need. Typical application is 7 pounds per square foot on flat or sloped sides. If the sides are 40 degrees or steeper, it is suggested not to use Pond Seal as it will just roll down to the bottom of the pond.


About the author: Darrell Rhoades is the founder of Whatpond.com. A one man business, works full time in tool & die. It all started when he built his own pond for the family. Ran into pond issues and started the research with pond suppliers and conferences for pond management. He writes about pond building and pond management and sells pond management supplies, aeration & fountains and Practical hands on experiences at Whatpond.com. . No physical store, but has items in stock.

36 comments… add one
  • Terry Felder Apr 18, 2011 @ 10:45

    I think this product is what I need for my pond. Awesome product!

  • Dwayne Pitts Aug 3, 2011 @ 11:50

    I have a pond 100′ x 220′ approximately 6′ deep that is loosing water how much product would I need to seal It. Thanks . Dwayne

  • Darrell Rhoades Aug 3, 2011 @ 18:34

    HI Dwayne, Is this a new pond that has always leaked? Or has it just started after years? How fast is it leaking, an inch a day or more?
    Or could it be the weather with out having any rain? Sorry for all the questions but these are what I’ll need to present to the company.
    If you built the pond was there any areas that where questionable about the soil content, knowing this would be much less expensive than
    applying to the whole pond.

    Another item is when it is raining and supplying the pond, does the pond lose water. Sometimes having springs is good tor supply but when
    they dry up they can act as a drain to the pond and back filling the spring.

    Please reply with answers so we can figure out what is going on.

  • Jason Schwark Aug 17, 2011 @ 17:05

    I built a pondless waterfall two years ago. This past week it developed a leak in the bottom of the liner, it holds approx. 250 gallons of water, we put large round stones and milk crates in the base of the fall and then covered it with a decorative stone. I am positive I have a loss of water that is not due to evaporation. Please help!!!! Is your product gaurnteed to work in my case? Please call me or email. Ph. # 616-437-7642

  • Mike Brown Aug 21, 2011 @ 17:36

    how much is this product, i have a 200×200 pond and it is 70 percent dry now. Right now it is about 3 feet deep at the deepest part, if it did not leak it could be about 12 feet deep all the way around. Because it is so dry now, now is the best time to try to fix it.

    can you tell me how much of this product i need, and the price and shipping costs to Iola kansas?

    mike brown

  • verne may Aug 26, 2011 @ 17:16

    I have a waterfall with a liner storage pond, it leaks water will this work for it. can I just dump some in and let it circulate until it seals the holes? it holds about 500 gallons.

  • Darrell Rhoades Aug 27, 2011 @ 9:16

    I had this conversation with a fellow who had the same problem, a leak in the liner and the result using this type Pond Seal most likely wouldn’t work.
    This is a sodium bentonite powder form around a small stone. So it wouldn’t really flow to the leaking area. The best way is to start emptying the pond,
    find the leak and patch the liner. I know it’s a ton of work but in the long run you’ll get the leak repaired with out guessing and dumping money down the drain so to speak.
    If you should find the leak we do have and under water pond sealer that would be applied directly on the hole or slit in the liner.

  • Garygus Sep 9, 2011 @ 14:09

    We have about a 60 foot x 60 foot maybe deepest in middle around 10foot deep. We seem to hold water around 6 to 7 foot deep and can fill up with well and it drops back down. Maybe it’s leaking around the sides above clay line? Would this product work for sealing up sides? How much would I need and what does the price run?

  • Larry Eason Sep 18, 2011 @ 9:30

    Hello ! I am cleaning out a old small pond and i am going to make it much bigger there is alot of mud now in the bottom of the pond going to atemp to push it out with a dozer,might need some of this product,if so i will need to know how much is your pond seal?

  • A.Grudowski Nov 17, 2011 @ 16:28

    Interested in price, shipping cost and availability to Ashland county, Ohio for pond repair, using your product – Pondseal. Estimated quantity would be three(3) 2400# totes. Thanks

  • Jay Jan 4, 2012 @ 7:41

    I have a new 4/10 acre leveed pond in southeast Texas which I initiated pumping water into at night in late November. i pump approximately 7000 – 10,000 gallons a day. The pond level has steadily risen with this well water and some good rains to a level of 4 ft over the past 6 weeks. However in the past week the pond did not continue to rise and now has began to fall about an inch a day evnthough I continue to pump water nightly.

    Is there a potential application for your product in my situation and if there is what would be your recommendation for appication.

  • Charles Smith Jan 14, 2012 @ 15:46

    I have a pond that is approximately 70′ x 100′ x 15′ deep. I have about 12″ of clay in the center and about 6″ on the sides, I pump water in but loose a lot of water in a few days. Will your seal help me and what would be the cost, I live in Northern Indiana close to South Bend. Chuck

  • Roger Lipe Feb 4, 2012 @ 7:34

    My pond leaks around some roots at the base of the dam. It’s a small area, about 10″ across. The trees have been cut down. After the pond fills it drops about 18″ in a couple of days. How much PondSeal would I need and what is the cost?

  • Robert Gourley Apr 23, 2012 @ 16:05

    I have a leaking pond it is about 1&1/2 acres. I have dug out the damn and one side of the pond and repacked with clay. The result is that it is leaking worst than ever. HELP!

    Bob Gourley

  • chris Apr 30, 2012 @ 10:45

    I need a quote on sealing a pond that is 60′ x90′ x 15′ deep. Do I have to drain it to seal it or can i use a boat to spread the pnd sealer evenly over the bottom?

  • Gael Baumgart Jun 23, 2012 @ 16:33

    I have a pond that is around 150×150 that won’t hold water. We had a man with a bulldozer dig a hole around 5 to 6 ft. dip he dug down to slate and you could see water running in. He said he would put a high grade of plastic and fill the hole back up with the dirt (it was like a sink hole ) it did help just a little it’s holding maybe 2ft. of water but it is still going down slowly. What would you suggest I do to seal the pond. I had thought about a liner but that would cost a lot. Thanks, Gael

  • Allen Aug 9, 2012 @ 15:46

    I have a 1/2 ac pond with a half levee. The levee leaks in one area. Howrah sealer and price? Please!

  • Steve Watts Nov 13, 2012 @ 13:43

    I have a leaking pond I am just starting to look for a solution How much is your product in 2400# bags. at seven pounds per square foot I may not be able to afford it. I live in Munford Alabama 36268

  • Frank Loverde Jul 14, 2013 @ 10:25

    I have a new pond, less than a year old. We got 4 1/4 inches of rain the other night and our pond is now full, over a 3 day period we have dropped 18″ on the spill pipe but our dam is not leaking. Our pond is 1/2 acre and is 9 feet in depth to 4 feet where water enters the pond. How much sealant will it take to seal it? Thanks Frank

  • Adam Lambert Jul 20, 2013 @ 7:56

    Our pond is about 75 x150 and averages about 12′ with the deepest spot being about 15′. A seep has developed on the dam side of the pond, would your product be right for this application. How much would I need and what do you estimate the cost to be?
    Thanks, Adam

  • dawn kingus Sep 2, 2013 @ 13:11

    We have at least 4 muskrat holes that need to be filled. We are in Mespotamia Ohio.thanks

  • Virginia Apr 22, 2015 @ 1:39

    I have a large rock (approximately 5 ft across and 5 ft across . A hole was drilled into it. The rock has a large crack that has been sealed by a product (brand unknown) from a landscape company. The water continues to flow out from the rock. The rock may have leaks in various places as the flow is extremely fast. Can you suggest a product that may work to fix these major leaks? Replacing the rock is not an option.

  • wendy boyd Apr 28, 2015 @ 17:37

    can i put seal in pond with alittle water in it ??

  • Cindy Mabus Jun 27, 2015 @ 16:24

    We have a half acre pond that was dug in 2003, around 2012 we noticed the water level was not maintaining itself, it goes down about 3 foot, it appears that a field tile is the problem, we really hate to have to start digging up our yard to find and cut the tile, will this product work for our problem. We have a real good idea where the problem is as we found several pieces of clay tile in one area. If this will work please let me know appx how much we would need to purchase. Thank you in advance

  • Vinod Jul 13, 2015 @ 18:42

    Available in Palm Beach County Florida ? Looking for smallest package. Thank you.

  • Darrell Rhoades Jul 20, 2015 @ 4:30

    Smallest package of Pond Seal is 50 bag $34.19 plus shipping. Shipping cost are approx. $1 per pound. It would be cheaper if you could find a dealer more local to your area.

  • Ken Ryan Aug 2, 2015 @ 15:10

    My pond has too much gravel in the bottom and sides. It fills after a 2 or 3 in. rain then leaks out at about1.5 in./day. I would like to seal it.


    Ken Ryan

  • Darrell Rhoades Aug 3, 2015 @ 4:53

    Hi Ken, Does the pond leak all the way to the bottom? Or does it stop at some point? The question is to determine if maybe we have a leak at on the side of the pond or if the entire pond is too porous and leaks out completely to the bottom.

    There are three options that I know of to seal a pond. Pond Seal is one of them and there are limitations, steep side wall it will not work on as anything over 40 degrees the pond seal will simply roll down the side to the bottom leaving the sides unprotected.How much Pond Seal would you need? You will need the square footage of the pond including the side walls. Then for an average coating multiply the square footage by 7 lbs per square foot for a total of product. This will also be the weight for shipping by freight.

    Using a pond liner could be the answer as well but please read the pond liner page for more information about pond liners. You would figure the square footage of the pond, including the sides times 2 plus a few extra feet for anchoring the liner and shipping as the liner will be quite heavy. Anchoring can be seen on the liner page as well.

    Lastly is a product call ESS-13 by seepage control Get a hold of these folks and let them know I sent you. They will help determine the amount of water loss and if their product will be able to work for your situation. The hard part with this product is keeping water in the pond and moving around so it can find the leak and seal it as it leaks through the leaking areas. Bottom diffused aeration is the best method for keeping the water moving and product suspended to be efficient in dealing the pond.

  • Solomon's Gardens Oct 27, 2015 @ 17:35

    Is this product mainly for fixing leaks or can it be used to build an entire pond? Thanks!

  • Darrell Rhoades Nov 7, 2015 @ 4:07

    The product can be used for the entire pond to seal. Pond Seal will work as a repair product or lining the entire pond at a rate of 7 pounds per square foot, which is shooting for about 2″ thick of material. I believe that was brought up in the recording on the page above. Depending on the size of pond it could be a large quantity. Another point to look at is the side walls of the pond. If the are 45 degrees and steeper you may not want to use the pond seal as it will slide or roll to the bottom of the pond. Hope this helps.

  • Steve Rankey May 1, 2016 @ 18:39

    Our 1/3-acre pond has never filled higher than the bottom edge of the stones in the 8 years that we have had it and remains at this level. A liner estimate was cost prohibitive. I read about bentonite but don’t know of any local source. Please tell me about Pond Seal.

  • Charles Boyd May 6, 2016 @ 14:51

    Have about one fourth to one half acre pond that is 2 yrs old. Losing about one inch per week in water level. What do you suggest. Thanks

  • Wanda kirk May 12, 2016 @ 18:08

    I have a pond that is about 50′ X 100′ X 2-1/2 feet deep. It has a solid natural granite bottom but the soil is kind of sandy and tree roots make it porous. The pond is Spring fed about a gallon a minute but is losing a higher ratio which is causing a lot of frustration. I have about 75 koi fish that I’m a little worried about. The water is leaking under the banks making the perimeter of one side of the pond mushy in some areas. can i seal,it without draining the pond ? The banks have a slight slope but I don’t know if it’s 45 degrees? How would I determine that ? Also, what is the application method and how much would I need to do the one side ?

  • Wanda kirk May 12, 2016 @ 18:09

    Ps. thank you for your time and help.

  • Kelly Slovacek Oct 26, 2016 @ 20:32

    Our pond leaks from the back somewhere and how much would it cost to buy the stuff to fix the pond. I would like the pond to hold water.

  • Darrell Rhoades Nov 7, 2016 @ 4:12

    HI Kelly, its hard to get a measurement from what you describe, but in the article towards the end it says “Typical application is 7 pounds per square foot on flat or sloped sides. If the sides are 40 degrees or steeper, it is suggested not to use Pond Seal as it will just roll down to the bottom of the pond.”
    Other questions are,
    How fast does the pond leak? an inch a week? an inch a day? or more
    Does the pond stop leaking at some point? Or does it leak all the way to the bottom?
    Has it always leaked or is this something that just happened?
    How large is the pond, 1/4 acre
    There are other products out there for leaking ponds so depending on how fast it leaks, the steepness of the banks would also help determine the product to use. Pond Seal is only sold by the truck load so shipping will become an issue, along with how you would spread it out, but also the other products will be shipped by truck and would need a fork truck to unload.

    Sometimes a you could find the leak if the pond stops at a certain point, dig out the bad area and refill with clay found locally would be the cheapest route to take.

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