Green Stuff....algae or filter problem

[aylad]

Killing the algae does usually eliminate the green, that's why you see water go from green cloudy to blue cloudy when the algae dies.

You might try CarlD and Poconos' trick of adding a handful of DE to your filter to help filter out the finer stuff, it's possible that the algae is just too fine for your filter to catch. If so, the DE should help. When you backwash, are you getting green water out?

Also, are you using sand or zeolite in the filter? The dust from zeolite is greenish in color, and it is fine enough to escape into the pool, especially at first.

Janet

[CarlD]

If you post your test numbers we can eliminate some possibilities.
1) FC
2) pH
3) CYA
4) T/A
5) Calcium Hardness