Agreed with Burger. You are on a scale with our PB resident mad scientist, Dr Frankondello. (Ewest, please insert pic)
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Since you had good results with a couple of products, it would be logical to mix up similar amounts of the litter with the soil and try it again to compare the sealing/leakage. As you probably already know, normal practice for bentonite application is to blend it with the soil.
