Iron in water source

[stcohen]

Yes, I am continuing with the cal-hypo/backwashing and the 1 cup Polyquat every other day. 3rd dose polyquat today.
BigDave, that makes sense, I think I did it that way but I will make sure to backwash before dropping the pH again.
Thanks,

[BigDave]

I haven't seen a recent pH or chlorine reading. How are you with chlorine?

Is the water clear but green or opaque green?

[stcohen]

This am pH 7.4, FC >5, water somewhat opaque green.
Have to leave until Fri. am. Will of course keep filter running; backwash and retest on return.

[stcohen]

Returned home. today
FC 5
CC 0.5
pH 7.4
TA 60
Ca hardness 130
CYA 50
Water appears green, not opaque, sediment on bottom, less than when I started this. Placed 1 cal-hypo in each skimmer. Plan to try a vacuum what sediment I can to waste this afternoon and backwash filter. Will adjust pH down after that if necessary.

[BigDave]

Orange sediment on bottom?

[stcohen]

Yes

[BigDave]

Is the filter pressure rising? Are the returns getting weak or is there poor skimmer action? Do you have a 2 speed pump?
It seems clear that the chlorine / raising pH is making the iron come out but it's not settling on the filter as we'd hoped.

[FormerBromineUser]

When Stcohen's pH reached 8, I encouraged him to lower it a tad to "no higher than 7.8". I sincerely hope I was correct on that.

Water described as green but not opaque, then "unchanged" over several days. However, his FC did drop at least once to 1.0.

What were results of sand test, Stcohen?

[stcohen]

pH 7.4
FC 15.5
CC 0.5
Did not test sand, reluctant to get into filter

[stcohen]