It works a lot like ESS 13 for a fraction of the cost. Think of it like pond dye which finds the leaks and escapes through it...same logic, it just plugs, expands, and seals instead of releasing through the fissure.
I haven't promoted this product until I used it on a few projects and researched it extensively and spoken to several customers who have also solved their issues. $432 worth of product solved my problem where two dozer/backhoe/trackhoe repair projects and $3500 later did nothing - plus I got to drain, seine, and dry my pond out over 3 months....twice. Good times.