Bromine Chemistry Question

[BigDave]

I don't think you need to add the DE nightly. Just when you backwash it out.

[PoolDoc]

What he said . . .

However, when the DE plugs, and pressure begins to rise, it can rise rather quickly to the maximum possible.

[FormerBromineUser]

After adding 2C dichlor at dusk.
PM:
pH 7.4
C 0
TA 190
CH 90
CYA 0
AM: same except I got 180 for TA

[PoolDoc]

Add 6 cups tonlght.

[FormerBromineUser]

After adding 6C dichlor and waiting an hour:
PM:
FC: 5.4
CC: 0.8
pH: 8.0
TA 200
CH: 90
CYA: 0

AM: (I did not get up at dawn but the auto-cover was closed)
FC 5.0
CC: 0.8
pH: 7.4 (but if I let it sit for a while it rises to 8.0 so maybe that was issue last night?)
TA: 200
CH: 90
CYA: 0 (but the mixture looked cloudier than last night)

[Watermom]

Read the pH when you do the test instead of letting it sit. Also, no need to test the CYA so often or you will run out of reagents. Once per week while you are using dichlor is probably plenty often enough.

[FormerBromineUser]

Thanks! That helps. Now I just need to know what to do tonight! :-)

[PoolDoc]

After adding 6C dichlor and waiting an hour:

AM: (I did not get up at dawn but the auto-cover was closed)
FC 5.0
CC: 0.8
pH: 7.4 (but if I let it sit for a while it rises to 8.0 so maybe that was issue last night?)
TA: 200
CH: 90
CYA: 0 (but the mixture looked cloudier than last night)

Leave the cover off, if you can. And add some muriatic acid, to lower the pH.

Read these pages:

http://pool9.net/ma/ (Using muriatic acid safely)
http://pool9.net/alk-step/ (Step by step guide to lowering alkalinity)

[FormerBromineUser]

Will do, thanks. I was wondering if TA was next...! Should I just use the pool calculator for maintaining my FC for now, rather than bugging you about it? If so, I will continue using dichlor until I get a CYA reading (unless you tell me otherwise).