Fine tuning my water balance suggestions

[lungs414]

28000 swg VINYL inground pool with the following:

ph 7.0
FC 4.6
TA 103
CH 124
CYA 36 But added almost 6 lbs less than 24 hours ago
salt 3400
borate 33
csi -0.9

Do I just aerate to raise pH or add some baking soda? If so how many days of aeration as i won't be home till next Friday. I can leave on the stairs jets, glorified bubble maker.
Pool only open 1 week

Thanks for all the help and suggestions.
Rich

 

[Butterfly]

We use Borax to raise pH and use Baking Soda to raise TA.

So, I suggest you use borax and raise the pH to about 7.4.

What is CC test result?

 

[JasonLion]

What kind of pool do you have (vinyl, fiberglass, plaster, pebble, etc)?

 

[lungs414]

Thanks

Its a vinyl pool..

 

[lungs414]

P.s.
Whats the difference between By weight or By volume?
If I buy a box of borax what does the box correspond to?
Thanks again

 

[duraleigh]

If I buy a box of borax what does the box correspond to?

weight

 

[JasonLion]

"by weight" means weighing on a scale. "by volume" means measuring in a measuring cup. Most solids are sold be weight. Most liquids are sold by volume.

 

[lungs414]

5 days later:
PH 7.8
FC 3.5 ppm
CC 0.5
TA 140
Ch 220
CYA 70
Borates 30-35 ppm

 

[linen]

Are you having problems with ph rise? If you are, then lowering TA makes sense. You can use the "effects of adding chemicals" section near the bottom of the poolcalculator.com to see approximately how much your TA will move down when you add MA. How long just depends on how much aeration you get and it is a slower process as your TA gets lower. Have you read: http://www.troublefreepool.com/pool-school/lowering total alkalinity

 

[lungs414]

Yes I did read it.

 

[linen]

One nice thing about TA, it typically lowers itself overtime, since higher TA causes ph rise and then lowering ph with acid also lowers TA. The net effect is a slow lowering of TA unless you are constantly filling your pool (i.e. lots of evaporation, splash out, etc.) with high TA water .

 

[lungs414]

Just retested with the following results:

PH 7.8
FC 4.0 ppm
CC 0
TA 130
Ch 220
CYA 70

 

[eluded]

No expert here, but yes you should use MA to lower you pH. 7.5 if you're not trying to lower TA any further and 7.2 if you are. Someone please correct if I'm wrong.

 

[lungs414]

Thats exactly what i put in the pool calculator.

 

[JasonLion]

Yes, swimming is fine down to a PH of 7.2.