hey group,
I have a 4-5 year old 2.5A pond that will just not clear up. I have tried it all and just can't get results. I dont have much erosion possibilities though I have a small stretch of bank that is not rocked. We haven't had rain here in 6 months and the water looks the worst it has ever looked...grey green with about 8-9" visibility. Pond seemed otherwise healthy until last September when I had a massive clam die off. they migrated right up out of the water and died on the banks. I never put clams in but I had thousands of all sizes die off. No fish kill though. Anyway, the water looks bad and I am at wits end. I haven't tested it but I'm pretty certain the water is high pH and very hard. Any advise greatly appreciated

Mike