Pool looked fine yesterday and family swam.
We have a Sentry device to add water if the level is low.
Over night I guess it stuck in the open position as this AM the pool was about to overflow, so I backwashed it down to the usual level. Removed more than 10”.
Then the sun came out and I saw that the water had a green tint. It was very clear as I could see all the little imperfections on the bottom.
Nothing really to vac and brushing raised no wisps of anything.
Chems at that time were CYA 20-30, fc 3.5, cc 0.5 and pH 7.6.
Wife confirmed it was unusually green so I started the slam. Now only 3 hours into it.
But a question(s) please.
The coping is a cantilevered cement slab with slate on the top and on the water ward edge. Raw cement on the bottom. And am sure there are old mortar defects that permitted the water to pass up behind the water ward slates. Also probably water passed under the cement slab.
Then the added water was well water. Now we just discussed metals in another thread and the well water has no iron and manganese .057, barely above the contaminant level of 0.5. And the pool water check at that time had Not Detectable Cu, Fe and Mn suggesting the well is adding little of any of them.
Is there anything other than algae that might have come from the coping or the well that would make a clear green tint?