Scale on tile (SWG in Phoenix)

greser

Member
Dec 13, 2017
11
Phx, AZ
I recently took on the responsibility of taking care of my pool. I have a 16000 SWG pool in Phoenix. There's a moderate amount of scale where the fountains come into the pool. My first set of calculations showed:
Fr Cl- 9.5
pH 8.0
TA 70
CH 575
CYA 33
NaCl 3800
SI 1.6
A program that I used suggested raising CYA to decrease scale. Would this help and to what level should I shoot for?

Thx, Greg
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,611
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
CYA (stabilizer) won't remove scale. It will however help your SWG work more efficiently. We recommend a minimum CYA of 70 for salt pools.

As for the scale, it boils down to 4 main (elevated) components - water temp, TA, CH, and pH. We know CH will be high in your area, water temp will go up in the summer, and your TA is fine. It's actually the elevated pH that's most critical to manage. It impacts the "CSI" the most drastically - see our PoolMath APP when you load your test results. By lowering your pH a bit and keeping the CSI slightly negative, you reduce the likelihood of scale.
 

proavia

LifeTime Supporter
TFP Guide
Feb 6, 2015
2,532
Chandler AZ
Pool Size
12300
Surface
Plaster
Chlorine
Liquid Chlorine
How are you testing your pool water?
How did you get a CYA reading of 33?
 

greser

Member
Dec 13, 2017
11
Phx, AZ
I tested CYA using the Taylor kit. 33 was my closest estimate. Let’s just say 33 –-ish
Is the best way to add CYA to buy conditioner from the local pool store?
 

proavia

LifeTime Supporter
TFP Guide
Feb 6, 2015
2,532
Chandler AZ
Pool Size
12300
Surface
Plaster
Chlorine
Liquid Chlorine
Round up - it's not possible to read single digits on the CYA tube as it's logrithmic not linear.
Your estimated CYA of '33' should be read as CYA 40.

Fill out your signature with your pool, pool equipment (including manufacturer and model numbers) and test kit info. Be specific. This helps us to help you without needing to ask about your pool each time.
 

greser

Member
Dec 13, 2017
11
Phx, AZ
Thx proavia. I added what I have off the top of my head and will complete when I get home.
I did not know it's logrithmic (which is why I'm learning exponentially myself on this forum).
what's the best way to increase CYA?
 

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
18,592
Tucson, AZ
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Up in the Phoenix area I suggest you contact Mark White of Arizona Bead Blasting. He does pool tile scale removal and is a good guy, very professional. He used to do work down in Tucson but it wasn’t profitable for him to drive down here with all his equipment for one or two jobs and there are enough “hacks” in Tucson that do tile cleaning (poorly) on the side for cheaper so Mark really couldn’t compete with them. So he mainly operates in the Phoenix area.
 
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