Thanks!
I have read Pool School and a few other threads. I'm certain it's mustard algae.
I shocked it with
I have the Poolmaster 5 way test kit.
Amazon.com : Poolmaster 22260 5-Way Test Kit with Case - Basic Collection : Swimming Pool Liquid Test Kits : Patio, Lawn Garden
I also supplement with the 4 Way strips...just for a quick test and use that for my jacuzzi also.
Neither test for CYA, so I will need to expand the kit.
FC was high, PH was low, and TA was ok. I honestly think it was the pump not being on for...I know found out...3 days and being covered up.
I usually keep the FC high. I have a simple chlorine tab floater and test it every few days. I and/or the kids get in almost every day. I have the pump running for about 10 hrs/ day. (0900-1900)
I used Clorox Pool Shock Xtra Blue from Lowes.
Like this
Amazon.com : Clorox Pool Garden
I ended up using the whole thing. It says that 1lb is good for 10k gallons. I have ~4750 gallons.
Leaving it uncovered, I vacuumed, backwashed the sand filter, and shocked it on Friday and turned the pool pump to run constantly. Friday evening, it was very cloudy, so I used the rest of the shock. I backwashed Saturday and again on Sunday. By Sunday, it was mostly clear. I think I need to shock it again, as I was vacuuming again yesterday.
Is there a better shock to use? I'm not sold on the Clorox Xtra Blue at $4/lb.
I'm also researching an automatic vaccuum. Any recommendations? My Bestway skimmer bucket mount has already cracked.