Ok, pool pros, please help this rank amateur.
Back story -- 32,000 gal in-ground pool. Used Trichlor tabs exclusively for 18 months. (I had no idea tablets were any different from Chem Tek chlorine)
Finally, swimmers' blonde hair and skin began showing a green tint. Yecch!
Water test (then)
PH - zero.
Chlorine - normal
Pool store guy said CYA level was 100+. His advice: to add a 5lb box of soda ash AND a 5lb box of bicarbonate - simultaneously - thru the skimmer. I did.
Next day, pool was green and cloudy. A mess.
At bottom of filter was thick, turquoise-colored gunk, consistency of wet powder. (not algae) Many pounds of it. Flushed it all out.
I drained and refilled about 50-60% of the pool water. CYA is still high but chlorine is normal and PH is close to normal. (Adding soda ash nightly).
Water is pretty clear. BUT --
there is a constant film on the water - definitely NOT sunscreen or baby oil. The film resembles the tint of the turquoise gunk I took out of the filter.
What is that gunk and how do I eliminate it? I seems to re-generate, as filtering does not remove it.
Any help will be greatly appreciated.