Big storm a few nights ago in VA...had to drain water...

[GuinnessPhish]

test results have changed:

pH 7.4
FC 4
TA 60
CH 120
CYA 25



I added what I had left of a calcium increaser.....probably a pound or two.

I also added about 4 oz of soda ash to bring the pH up a little, probably to around 7.6.

Really necessary to increase TA, or am I ok as long as I keep my CSI within range of no less than -.6 and .6?


Do I really need to bring CH up to 220?

 

[woodyp]

pool-school/recommended_levels There ya' go.

 

[GuinnessPhish]

I need to add 10 pounds of calcium chloride in order to get to the minimum recommended CH of 220 for fiberglass pools.

Where's the best place to get calcium chloride?....the pool store?

Add this all at once?

 

[GuinnessPhish]

Based on my initial test, I need to raise CH, TA, and CYA just a touch....

what order should I be doing this?

 

[duraleigh]

Importantly, bring CYA up to 40 ppm or so so you can hold FC a little better.

I do not know where to get Calcium Chloride.

You can adjust all three one right after the other in no particular sequence. Personally, I would leave TA alone.-

 

[GuinnessPhish]

I'm going to be raising CYA slowly by using trichlor tablets that the previous owner left for me...

since those are acidic, it will be lowering my pH.....and also lowering my TA as well?

 

[JohnN]

Yes, it will lower your pH, and will slowly lower your TA. According to chem geek, for every 10 ppm of FC added by tricolor, it will add 6.1 ppm CYA and decrease TA by 7.1 ppm.

 

[GuinnessPhish]

Importantly, bring CYA up to 40 ppm or so so you can hold FC a little better.

I do not know where to get Calcium Chloride.

You can adjust all three one right after the other in no particular sequence. Personally, I would leave TA alone.-

Just curious....

why would you leave TA at 60 if recommended levels are 70 - 90?

At what point should I raise TA?...and to what?

 

[GuinnessPhish]

^^^^^??????


What about CH recommended level of 220? Should I worry about adding more calcium?

My water is crystal clear, and there's no signs of staining. I've increased my pH to 7.5 to account for the acidity of the trichlor tablet I've got in the chlorinator to help raise CYA a bit. I'm assuming that my TA has gone down about 3 to TA 57 because of the trichlor tablet. Using these numbers my CSI is -0.52:

FC 6
pH 7.5
TA 56
CH 130
CYA 28

Am I ok as long as I don't let the CSI go less than -0.6?

 

[GuinnessPhish]

anyone? Bueller?

 

[Donldson]

Let me guess, pool store numbers?

Everything looks fine enough that there is no need to panic, just some minor adjustments. You just need some calcium increaser if you want to get that to recommended fiberglass numbers. Should be at any pool store. Your CYA could use a bump but you say you are using trichlor to do that. If your pH starts drifting down due to trichlor use some washing soda to bring both pH and TA up. If the pH doesn't go down much just some baking soda to raise your TA to where you want it.

EDIT: If the pool store doesn't have calcium increaser you could chlorinate with cal-hypo for a while to bring the numbers back to where you want them as well.

 

[GuinnessPhish]

Let me guess, pool store numbers?

Everything looks fine enough that there is no need to panic, just some minor adjustments. You just need some calcium increaser if you want to get that to recommended fiberglass numbers. Should be at any pool store. Your CYA could use a bump but you say you are using trichlor to do that. If your pH starts drifting down due to trichlor use some washing soda to bring both pH and TA up. If the pH doesn't go down much just some baking soda to raise your TA to where you want it.

EDIT: If the pool store doesn't have calcium increaser you could chlorinate with cal-hypo for a while to bring the numbers back to where you want them as well.

No....no pool store numbers, TF 100 numbers.

So, adding soda ash (pH up) will also increase TA as well as pH?

 

[Donldson]

Yes, soda ash will raise both. Sorry to assume those were pool store numbers, but when you put 28 for CYA or 56 for TA, they sound like pool store testing.

 

[GuinnessPhish]

Yes, soda ash will raise both. Sorry to assume those were pool store numbers, but when you put 28 for CYA or 56 for TA, they sound like pool store testing.

Gotcha....

no, I was using tf 100 test results, and then using the "Effects of adding chemicals" section.... after I got initial results of TA 60 and CYA 25, I then added 8 oz of trichlor.