Pool math question

CR172 · Apr 3, 2019

We are putting in a new 24ft Saltwater 8000 from the Pool Factory in the coming weeks and I've been looking at Pool Math to get an idea of how much salt, CYA, etc I'm going to need. I'm really confused at the amount of bleach it's telling me I need. 80 oz? Really? That cannot be anywhere near enough. The salt and stabilizer look realistic. What do you folks think?

mknauss · Apr 3, 2019

For 13500 gallons, that is correct amount of 8.25% bleach to get to 4 ppm FC.

CR172 · Apr 25, 2019

Pool is in, pump/filter and SWG been running for about a week and a half now. I know, no pics..... Water is clear and here are my numbers.
Salt - 3000 (just had a bunch of rain)
FC - 12 (high)
CC - 0
TA - 210 (real high)
CYA - 70
PH - 7.5
I've added, I believe, 4 gals of Muriatic acid already. How do I get the TA down? And the FC is too high but I'm running the SWG on its lowest setting. We are still back filling/leveling the area so we can start on the deck so I don't have my electric pole and timer set up yet. I've been turning on the pump and SWG in the morning before work and turning them off when I get home. Roughly 10 hrs. The pump is running on low speed.

Richard320 · Apr 25, 2019

Just leave the SWG off for a day. FC will probably drop to 4 or 6.

TA is the last thing you worry about, and only if you tire of daily acid additions. In fact, I question whether it really is 210. There is a known issue with static electricity on the tip of the R-009 making drops smaller so falsely higfh readings. The fix is to wipe the tip with a damp paper towel between drops.

Anyway, as you adjust pH, TA will come down. pH will rise again but TA will not, unless you add more high-TA fill water. So just be patient with it, and target 7.2 when you do add acid. It'll pop up fast, but it will also drive TA down faster.

CR172 · Apr 25, 2019

Thanks Richard. I'll retest the TA and wipe the tip in between drops tomorrow.

CR172 · May 2, 2019

Today's numbers.
FC 4
CC 0
PH 7.2
TA 50 (a bit low)
CYA 60 - 70 (was 70 last time I checked but we've had some rain and I'm out of R-0013)

Richard320 · May 2, 2019

CR172 said:
Today's numbers.
FC 4
CC 0
PH 7.2
TA 50 (a bit low)
CYA 60 - 70 (was 70 last time I checked but we've had some rain and I'm out of R-0013)

Then it looks like you just need to turn the SWG on again.