On PH! The noly product I have found that masters the PH in my pond is sodium biphosphate. Is there any way to buy this stuff in buld and not in littel 2 lb bags?
If the product that you have had luck with was purchased through PondMarket.com then there may be a possibility that you could get it in bulk if you call 1-800-577-5605.
If you did not get the product through PondMarket.com I would suggest contacting the company you did purchase through or the manufacturer.