my chlorine is good but water is green

[Simmons99]

river-wear-

You stated that you are not sure why the algae started in the first place. Could it be that the FC reading is the "highest" it is during the day?

I have my pump/SWCG run for 2 hours in the wee morning hours (this is when I add chemicals), and then run an additional 4 hours in mid-late afternoon. Before the pump kicks on in the morning my FC=3-3.5 and after the pump runs for about an hour or so FC raises up to 5ppm.

Could it be that your FC dropped down to ~1-2ppm? If so - that could have been enough to start the algae?

[river-wear]

Simmons99, I'd say anything is possible. I usually run the filter 10am-4pm (10-6pm when it's hotter) and check the chlorine level at random times - but always after the filter has started.

Once I clear up my bloom, I'll experiment with this and see how much variation I get. My SWG has been running at 36% so I didn't expect large swings.

I've also been meaning to change the timer settings so the filter would run in two time blocks, which would also keep the Cl level more steady. Guess I'll get "around to it" very soon, especially with cooler weather and shorter filtering time on its way.