Hello from Australia, southern east coast, Geelong, Victoria, the beginning of Autumn (fall) but still lovely weather (low 30's 86f), we have a 15000lt 4000gal, above ground plastic liner type pool, its been great for a few months, nice and clear, checking FC and PH daily, adding granular chlorine daily too, pretty sure its CAL-HYPO, recently bought a Hach brand strip-type test kit. But i prefer to test PH with the phenol red 5 drops on the color chart.
Anyhow the issue is the bottom of the pool will be a slight green (after 12 hours of not being used it settles), see attached pic, the water is clear but theres a layer on the bottom of the pool, i vaccuum it into the sand filter and most of it stays in the filter but some of it gets stirred up and the water goes a slight shade of green.
Seems its a algae issue, i like the PH around 7.6, when i SLAM the FC goes to over 20ppm, havent had the TC above FC yet. CYA is always low, towards 0. TA around 100, Total hardness around 250 (not that i know what hardness is used for)
This sediment on the bottom seems to be an almost on-going issue despite the FC staying above at least 5ppm after the Shock (above 20) and daily vacuuming.
When SLAMing how many days do i maintain high FC (10-20 or above) for?
Anyhow the issue is the bottom of the pool will be a slight green (after 12 hours of not being used it settles), see attached pic, the water is clear but theres a layer on the bottom of the pool, i vaccuum it into the sand filter and most of it stays in the filter but some of it gets stirred up and the water goes a slight shade of green.
Seems its a algae issue, i like the PH around 7.6, when i SLAM the FC goes to over 20ppm, havent had the TC above FC yet. CYA is always low, towards 0. TA around 100, Total hardness around 250 (not that i know what hardness is used for)
This sediment on the bottom seems to be an almost on-going issue despite the FC staying above at least 5ppm after the Shock (above 20) and daily vacuuming.
When SLAMing how many days do i maintain high FC (10-20 or above) for?