I'm confused on why you bought 2? My pond is .75 acres as well and he told me one 6 gallon container was more than enough for one treatment. Are you just going for the overkill hoping it will have a better chance to seal or did I not buy enough?? Let me know how the trash pump application works. If I have to treat this again I may not have 6 hours to stand around with a garden hose.
