I read the info at the sites posted about the septic treatment bacteria. The way I understand it you will need alot of this stuff for a pond. From what I gather the packets are for 500 - 1500 gal. septic systems. That's alot of packets for a 1.5 acre pond. I'm all for saving money but I'm not convinced we're comparing apples to apples here.
I just purchased Aquatron and Waste and Sludge reducer. 10Lbs. each will treat my pond for 1 year. Price $417.00. Yeah, that's alot of money but it is specifically for a pond and tested as such.
I'm not saying the other stuff won't work but I don't think the quantities packaged are intended for ponds. The only reference coming close was for a lagoon and it said 12 packets a day.
Just my 2 cents.