Hello all.

I have a 18'x36', vinyl, 32K gal IG with a Aquarite SWG.

The SWG is on its 3rd season and I'm having trouble keeping green algae from forming this season. I have cleaned the SWG with muratic acid/water (as per Aquarite) 36 hours ago. The SWG has been on superchlorinate. The algae has returned.

Tot Alk. = 140
Ph = 7.4
Na = 3100
CC (at the return) = (TC/3.0-FC/3.0)=CC/0.
CYA = 80
Calcium = 370
Temp = 76F.
Rainfall in past 24 hours = 1-1.5 inches.

However, when I take chlorine readings away from a return, I get 0 -0.5(maybe).

Is the SWG on its last legs?

I feel like I'm fighting a loosing battle.