Why do I have to add Muriatic Acid to my pool EVERYDAY!!?
I have a newly replastered inground pool that is now about 3 weeks old. The new plaster is just regular plaster with no color or agregate.
The pool is a salt water pool and is about 18,000 gallons. I live in central texas.
Every day I am checking the chemistry, and the chlorine is spot on (1 to 2ppm), the Alkalinity is 100, the salt level is 2800 or 2900 ppm.
However, the Ph is constantly high 7.8 upto 8.2 which requires 2 to 4 cups of Muriatic Acid to bring down to 7.5.
So thats 2 to 4 cups of Acid EVERYDAY! or just over a Gallon a Week!
What am I doing wrong?
The pool runs for about 8hrs a day, has a raised spa that water trickles over, and has a beach area.
Please help!!
Oh… it also has a DE Filter…
The key issue is “newly replastered”.
New plaster has lots of lime/limestone content which leaches into the pool for several months after it is completed. The lime is a base which drives your PH up. This is pretty normal – I experienced the same thing with my pool for about 4 months after the fresh plaster.
You can move this along by brushing your pool walls regularly (daily) for a few weeks to dislodge loose dust/plaster left on the surface. Keep track of your filter – this will likely require it to be cleaned.
Good luck and enjoy your pool!
2011 Sec 4 E-Learning Chemistry SPA Skill 3
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