Testing and start up new pool

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Re: Owner/builder SoCal

I added 133 oz of 8.25% bleach last night and got FC up to 3.8 (target was 4.0). Had no CYA in the pool. Today was bright and sunny all day. Just checked FC of 0!

So added 4 lbs of CYA split between 2 skimmer socks. Pool Math called for closer to 7 lbs. didn't have enough. Hoping that will help keep me from having to add a bottle of bleach per day.


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Mod note: This post was moved from another thread.
 
Added 5 lbs of Clorox Calcium Increaser tonight to 43F degree water. Deep end. Had to brush bottom to mix it up and get it to dissolve. Will probably need to add another 5 lbs tomorrow.

Trying to get 20K pool up from 200 to 250 CH.


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Really wish Pool Math would save settings. I swear every time I return to the page on a PC or phone I have to re-input my parameters.

Anyway, my CSI was 0.05 this morning and target is -0.47. That's still good, right?


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It should save whatever you entered last time. It does for me. Maybe hit the calculate button to be sure? Do you have cookies disabled?

CSI between -0.6 and +0.6 is ok
CSI between -0.3 and +0.3 is best
for a saltwater pool during swim season CSI between -0.3 and 0 is ideal
 
OK. Must be iPhone safari browser issue. Each time I return to page, it resets input fields. Still wish there was an TFP iOS app!

Anyway, I'm officially at -0.38 now with a target of -0.34. Not sure how O can get much closer [emoji3]

Also there must be some CYA in my pool though it wasn't dissolving quickly...I seen to be retaining some FC finally. Left this morning at FC 3.6...added bleach up to 4.0. 4 hrs later still at 3.8. Before any CYA I was plowing thru bleach on sunny days.


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-0.38 sounds good! FC usage slows quite a bit when the water is below 60. Plus, the sun is lower and the days are shorter. Also, CYA dissolves more slowly in colder water too.
 
Now that is cold, with an avg water temp of about 44F, and plaster no longer new (over 2 wks old) should I focus on keeping FC at 4.0 and pH at 7.5 until weather gets warmer? No other chemicals (CYA, Calcium) seem to dissolve in the water. Water is crystal clear.


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Finally getting somewhere. Still cold water (41F) but pH steady 7.5 and starting to see some CYA register.

pH 7.5
FC 4.0
CC 0.0
CYA 20 (maybe slightly less, close)
CH 280
TA 120
CSI -0.24 (target -0.5)

1.) Is there a standard top-down order to list them in?

2.) Pool Math says only to add 60 oz of CYA but am still slowly dissolving in a sock.

3.) lately am only having to add smaller amounts of 8.25% bleach daily to maintain FC 4.0

4.) am I now in a good place?


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Yes, numbers are good. No need to target CSI of -0.5. -0.3 to 0 is perfect. You can wait 24-48 hours after all the cya is dissolved to test again. Squeezing the sock will help dissolve it faster.
 

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I've never had a pool before. New Diamond Brite.
Liquid chlorine. I wasn't expecting plaster to be perfect and perfectly uniform. Does it change over time? Some days I notice spots, other days I don't. Have just come to accept them as I'm outside everyday taking water samples.
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We're getting there. Second month of new plaster. Water temp 50F.

pH 7.8 (added 22 oz acid)
FC 3.6 (added 13 oz bleach 8.25%)
CC 0.2
CYA 20
CH 300
TA 120

CSI 0.17


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Water is and has been crystal clear. So clear, like it's not even there (unless there are ripples in water).

pH ever so slowly creeps up over a day or 2. Usually stays around 7.5 for a couple days at a time.


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How long does it typically take plaster to cure? Realizing no two pools are alike.

Pool Math targets 70-90+. Mine has stayed at 120 for a few weeks now. Should I try to drop it now? Or does that require dropping pH to a level not good for newer plaster?


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The first 30 days of plaster cure is most important. It takes a year-ish for plaster to fully cure and make less of a contribution to the water chemistry. But, I'm not sure it ever really stops. The benefit of lower TA is to reduce the upward pressure on PH and slow the rate that pH rises. Lowering TA is a process of adding acid to lower TA and pH and then aerating to raise PH only and leave TA reduced. More here, Pool School - Lower Total Alkalinity
 
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