SoilFloc Pond Sealant

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  • 2-part polymer soil sealant.  Apply through the water.
  • Soilfloc Pond Sealer Part A - Apply first.
  • Soilfloc Pond Sealant Part B - Apply second.
  • Laboratory testing of Soilfloc for pond sealing


Polymer Pond Sealant - Apply Through-the-water 

Soilfloc is a polymer based soil sealant that can be applied through the water column to seal soil seepage without draining the pond or reservoir.  It is non-toxic, biodegradable, and has been tested for impacts to aquatic organisms in major University Studies.  It can also be applied during construction to improve the soil's sealing capability.  This is by far the most cost effective method to attempt to seal a pond without completely draining the water.

Soilfloc works best in ponds and reservoirs with widespread seepage or with significant localized leaks.  The polymer works by swelling in soil pores and attracting fine clay particles to further clog the soil.  For larger leaks, pond dye can be an effective tool to observe sub-surface currents and identify the leak area.

The 2-Part polymer based sealant is supplied in a fine granular form.  Each unit includes 55 pounds of Part A and 55 pounds of Part B.  Each 110 pound unit treats approximately 3,000 square feet of pond bottom.  Heavier application rates may improve effectiveness.

Soilfloc Sealant is the best polymer based sealant available for your canal, irrigation ditch or pond. Specifically designed to find leaks, whether in the floor, the wall or through rock formations and seal them. Soilfloc contains linear and cross-linked polymers to seal any type of soil, for any sized project. From small earth-bottom Koi ponds to large ponds and lakes, it is an extremely cost effective solution to your water loss problems.

Soilfloc Sealant is the product of choice for sealing leaks without dewatering ponds, reservoirs, irrigation ditches, watering holes, golf course water hazards, and residential ponds.

  • Easy to use
  • Cost effective
  • Long lasting
  • No need to drain water
  • Material is drawn to leaks and seals
  • Non-toxic, biodegradable, environmentally friendly
  • Will not harm livestock

If your pond / lake / reservoir has water in it & is currently leaking, now is the best time to apply. The flow toward the leak, draws the polymers into the problem areas to seal the leaks.

Do not under apply! 

Not recommended for application to water bodies less than 10,000 square feet in size.

Prepping for Application

Remove any deep silt, livestock, dense reeds or heavy vegetation, as they can impede the polymers ability to get to the seepage.

Soilfloc Pond Sealant Application

Simply sprinkle Part A and Part B over the surface of the water. The water should not be moving and you should not apply during rain or wind events. Distribute it as if you are “feeding chickens” at the recommended rates. Remember to cast out gently no more than 5’ by hand, scoop or fertilizer spreader from a boat or raft.

Apply minimum of:

4 oz. per 10 sq. ft. applied as follows

Soilfloc Sealant Part A 2 oz. per 10 sq. ft.

Soilfloc Sealant Part B  2 oz. per 10 sq. ft.

Apply Soilfloc Sealant Part A to approx. 10 sq. ft. section first followed immediately by Part B to the same 10 sq. ft. before moving to the next section.

What is Soilfloc® Sealant?

Soilfloc® Sealant is a polymer based, Earthen Pond Sealant.    Polymers make up many of the materials in living organisms, including proteins; they are natural or synthetic substances composed of very large molecules (macromolecules).  Soilfloc® Sealant is an Anionic Polyacrylamide polymer, also known as PAM.

What is PAM?

PAM is a synthetic (man-made), potassium or sodium based, long-chain polymer (same molecule repeating itself many times) designed to attract either positively charged particles or negatively charged particles.  Anionic polyacrylamide has no aquatic toxicity

How does Soilfloc® Sealant work?

Soilfloc® Sealant is a combination of synthetic, anionic PAM’s, that both flocculate and hydrate, to plug leaks and stop water loss. There is no need to empty your pond, Soilfloc® Sealant works best when it’s full. It’s designed to locate leaks by following water as it’s pulled into the cracks and crevices by the leak.

What is flocculate and hydrate?

Anionic polymer has molecules that carry negative charges. They attract positively charged suspended clay particles much like a magnet picks up metal.  The other unique aspect of the formulation is the anionic cross-linked, insoluble polyacrylamide, which absorbs and retains large amounts of a water (over 300X its weight). Together, this powerful combination is pulled into cracks and crevices by the draw of the leak, binding suspended and surface solids, and swelling to over 300X its weight, to plug the leaks and stop the flow of water.

What can I expect during application?

Soilfloc® Sealant is a highly effective solution to leaking ponds.  However, it must be applied properly to work.  Product application does require some patience as fine particles accumulate in the PAM over time. When properly applied it gives the pond soil matrix the ability to reduce leaks that normally would not be fixed without reconstruction or full geomembrane pond liners. 

Wear protective clothing and appropriate personal protective equipment!  Because Soilfloc swells significantly in the presence of water or other liquids we recommend that applicators wear eye protection, industrial grade respirator, and ear plugs while applying the product.  Our applicators generally wear a disposable, hooded tyvek suit as well.

The full effect of a polymer pond sealant treatment is usually not seen until at least 3 weeks after treatment.  


SOME Soilfloc® Sealant part B will float; this happens -it doesn’t mean there is anything wrong with your product!  This is especially true if you have a pond with large cracks and crevices and have custom ordered larger sized crystals to seal your leaks.  Because they take longer to swell, they may not sink before swelling. You may also see these polymer crystals at at the bottom of your pond for a while following application, they’ll eventually become part of the soil matrix.

Unsure about the best treatment to seal your leaking pond? Read More Here

Some Soilfloc Part B may remain on the water surface for a period of time

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6 Reviews

  • 5
    Very pleased

    Posted by Michael M, NY on Oct 24th 2018

    This product works exactly as described. It's quick and simple to use. Just have to wait for the perfect timing to apply it.

  • 5
    soilfloc sealant

    Posted by J Gillespie on May 9th 2018

    soilfloc has sealed my dirt pond easy to spread well pleased with it

  • 5
    I think it actually worked!

    Posted by Ron on Jan 9th 2018

    Just a follow up that I did receive the Soil Floc sealant and applied it as directed on Dec. 23. I can't hardly believe it, but I think it actually worked!!
    A couple of days after application, the pond level started to rise as I continued to pump water into it. Previously, the water was leaking out as fast as I could pump it in. The pond filled up, and I shut the pump off. After two days, it has only gone down about 1/2 inch….which means it's still leaking a little, but nothing like it was when it would go down an inch or more in a 24 hr. period.
    I did find two dead fish the days after I applied. I can't say that was caused by the Soil Floc, but even if it was, two is no big deal…..if that is all that died.
    Should it continue to "seal" as time goes on?
    If this proves to have worked, I will say it is the ONLY product I've tried that actually worked. I put 10,000 lbs of Bentonite in the soil in two different applications and that did not seal the tank.

  • 4
    Good Product but Not for All Ponds

    Posted by Andy on Nov 18th 2017

    I previously reviewed this product after applying it to two small ponds that have the same gravel base as the one I recently treated. The ponds are in west TN. They have a large draining area so can accumulate al lot of rain water but have no natural water source such as a creek or spring. The ponds can hold water after a rain but never reach even half capacity. . The smaller ponds had steep side slopes and were easy to treat being roughly 1500 square feet in surface area. I over-applied by using 110 pounds (55 and 55) for each pond. The recommended area per 110 pounds is 3000 square feet of pond bottom. Soilfloc worked well by greatly reducing the leaks. Based on this result I recently treated a larger pond with the same gravel base. The pond would hold some water for a couple of weeks at a time depending on the amount of rain but then would slowly go completely dry in less than a month. The current pond water surface area is roughly 4000 square feet but has the capacity to cover over 30,000 square feet. The logic was to treat the water level after a rain before it leaked. If the Soilfloc worked then keep treating the new water levels. I used approximately 180 pounds (90 and 90) of Soilfloc. The air temperature averages 60 degrees during the day so there is little surface evaporation. After about a week the pond has lost over a foot of water. I can think of a couple of reasons for the pond not holding water after the treatment. First, being all gravel and dirt the pond leaks all over, not just at certain points. A clay or dirt soil would work better. I probably would need to double the amount of product even though I was well over recommended dosages. Second, it is recommended that Soilfloc be used in 4' or more of depth. One side of the pond has only abut a 20 degree slope and the other side perhaps 30 degrees. Thus water on the edges is not deep enough. I need to see how much more the pond recedes. hopefully at the deeper depths it will hold. My other hope is that we get substantial winter rains that fill the pond faster than it leaks. Thus, as I treat the newer water it might hold. With subsequent treatment I may be able to stop most of the leaks although it may end up costing me a fortune. Anyone else in this situation is advised to compact the pond bottom well and to bring in clay prior to the pond getting water.

  • 4
    Seems to be working

    Posted by Andy on Aug 18th 2017

    My ponds have a great deal of gravel so tend to seep everywhere rather than any specific leaking area. Since the ponds are only a year old and being a hot summer in western TN it is hard to tell how much water loss is due to evaporation and how much loss is due to leakage. However, prior to applying Soilfloc it seemed that water loss was greater than afterwards. An occasional rainfall also makes it difficult since the rain brings the water level back up. I am still monitoring the ponds and as the temperature cools in the fall I will have a better idea.

  • 5
    I was skeptical but it worked!

    Posted by Jim in PA on Jul 23rd 2017

    Applied to 1/2 acre pond with leaking dam. It took about 3 weeks but all the wet ground outside the dam dried up and it is holding water much better now! Definitely worth trying at the price.

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