Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's part of the solution, probably

I'm not sure which worked -- I used Pond Balance, Pond Perfect, Barley Straw (Summit Chemical 130 Clear-Water Barley Straw Pond Treatment Twin Bale Pack for 2000 Gallons), and I frequently raked the algae. Now my pond (2500 gallon) is clear and clean. I haven't done any more work for several weeks. The goldfish are happy, but my lotus and water lilies are not blooming. Go figure.