Guys still shocking the pool using bleach and did the D.E. addition to my sand filter. I'm thinking my sand probably needs replaced because it took four cups of D.E. to raise my PSI by 1. But, it may be my imagination, however the water from the return actually seems visibly clearer as it comes through. I've got some serious bleach going now trying to crank my FC up to about 16 and burn off the CC and kill any additional algae of whatever kind. Did a backwash this morning and water was as brown as mud (good sign in my mind). Everything seems to be going okay, but....
as the water is clearing I am noticing a brown stain on my liner/steps again. I did the ascorbic acid treatment about a month ago and liner, etc. was all clear as bell afterward. My PH is currently pretty low and I had planned to keep it that way through the shock in order to insure I didn't get the iron/metal stain again. However, I fear it is showing up a bit and possibly was deposited even before I did the shock itself. My latest question is:
Can I add sequestering agent with my FC up this high and it still be effective? Or will the high FC react with the sequestering agent and "burn it off" so to speak?
Thanks for the info. Hear are my current numbers before adding four additional 182 oz bottles of bleach this afternoon. I have an inground vinyl liner with estimated capacity of 22000-25000 gallons with a sand filter (with D.E. addition added earlier today). Planning on doing an aeration/acid deal to lower TA in the next few weeks, btw.
Numbers before the four bottles:
(From Drop Test)
(From Test Strips [I know, I know, they are virtually worthless, but all I have at the moment to do CYA)
Total Hardness 150
Thanks for the help and help already given.