saltwater pool question

Total hardness and calcium hardness in pool water.
Scale, calcium buildup, hard water and scaling problems.
chem geek
Pool Industry Leader
Pool Industry Leader
Posts: 2381
Joined: Thu 21 Jun, 2007 21:27
Location: San Rafael, California

saltwater pool question

Postby chem geek » Fri 24 Jul, 2009 22:52

Just so you know, "CH" stands for Calcium Hardness and what you meant was "FC" for Free Chlorine. What is your Cyanuric Acid (CYA) level in your pool? You should just add extra chlorinating liquid or 6% unscented bleach to raise the chlorine to a higher level since you probably have some nascent algae growth. The calcium by itself would not have done anything to the chlorine generation unless it was so high that it caused scaling in the salt cell itself. If your water got cloudy, then that is possible. You can use 50 ppm Borates to reduce the possibility of scaling.

By the way, the pool store was wrong to advice you to increase your Calcium Hardness since you have a vinyl pool that doesn't require saturation with calcium carbonate.

Read Water Balance for SWGs and Shock Your Pool.


saltwater pool question

Postby gasman » Sat 12 Dec, 2009 08:39

re. the climbing ph problem in salt polls mentioned earlier,my experience was that 150 mls (approx a third of a gallon) of acid was required weekly to maintain the ph level,until I painted the concrete shell.Since then no acid has been required for many years.
When the pool was refilled,rainwater and carbon filtered water was used,giving a zero CH level.This was great,no cleaning of the cell,pool was clean,etc. under advice I have added calcium and used calcium hydrochloride to raise the CH ,now I have to sink a lot of granular acid to dissolve the brownish scale that covers the paint.
whats the difference between a vinyl or fiberglass pool and a well painted concrete one.
Swimming Pool Superstar
Swimming Pool Superstar
Posts: 401
Joined: Sat 16 May, 2009 09:20
My Pool: 16 x 32 gunite21000 gal., Diamond Brite Blue, Swimquip XL pump, DE36
Location: Texas

saltwater pool question

Postby czechmate » Thu 17 Dec, 2009 16:48

I would like to caution any gunite pool owners, who have this "problem with pool requiring acid weekly", as stated in article above, to think not twice. but ten times before painting their plaster.
It is lot cheaper to learn the reason for PH unbalance then draining, acid-washing and painting to have a result that may last for 5 years at best.
If done by the ever present "poolpainters" it will be peeling in 3 years.
To this present time, lasting paint that will adhere and last, is still waiting on the drawing board.

saltwater pool question

Postby m-nahorn » Wed 02 Jun, 2010 19:28

my pool is 2 years old and at the lower end of the steel wall started to rust and bled thru my liner and put a hole in 2 spots with in 4 feet of each other the pool company repaired them now this year same thing about 4 feet over same location at bottom of steel wall.if you rub the liner on the ohter side you can feel lumps under liner like corrsion is forming there also but not leaking thru

Return to “Hard Pool Water & Scale”

Who is online at the Pool Help Forum

Users browsing this forum: No registered users and 0 guests