Good morning all,
First time posting after reading a lot of good information.
Last week we fired our pool company after testing the water and finding every parameter out of range and having black algae around the bottom perimeter and sporadically over the bottom.
CYA ~200, FC 2.5, CC 0, TA 150, CH 525, TDS 700, PH 8
Since then I have shocked the pool with 18 lbs cal hypo 68% broadcast over the bottom, added 2.5 gal of muriatic acid (over three doses) and changed 8% of the water. My new readings are.
CYA~165, FC 15, CC0, TA 120, CH 475, PH 7.6.
The addition of the new pipe water 5 days ago turned the water green and it has been slowly getting lighter. The remnants of the cal-hypo also have the pool cloudy as the vac did not get all of the residue.
I know I need to change more water to get the CYA down but this is a neighbourhood pool and I dont want to close it for the three or four days that it will take to refill. I have the ability to add softened water slowly (from a residential water softener) and would prefer to make piecemeal water changes.
My question is three fold
1) What should be my priority for treating?
2) Do I need to do anything about the green? (sequester perhaps)
3) Should I attack the black algae now or wait till the CYA comes down?