low free chlorine

New here, trying to get some help on getting my pool operational again. A bit of context, First time pool owner here and things went smoothly last season. However, I opened my 30000 gal in ground pool on May 3, and noticed that the tarp over the pool had a leak so some of the nasty algae water...

Bought a house with a 25k pool 2 years ago (going on our third summer with the pool). The pool has always had issues keeping FC levels above 0 and high phosphates. This year we decided to switch to salt with a pentair ichlor30 and have been keeping it at 60%. The water is 85, and the pump and...