Low CSI on AquaBright finish

benm2010

Well-known member
Mar 16, 2017
143
Fort Worth, Texas
All,

Test results are as follows:

FC: 5
pH: 7.6
TA: 75
CH: 50
CYA: 60
Salt: 3200
Borates: 0
Temp: 85
CSI: -1.02

Fill water is from a well and is low calcium, high pH and TA. Have been fighting to get the TA down and to get the pH to stabilize. It has finally stabilized after a couple of months at the above values. I have a pool with an AquaBright finish and a traditional tile line. Should I now add calcium to get the CSI to -.6 or above or does it matter since the AquaBright acts like a vinyl/fiberglass pool? My PB stated chemistry will not affect the warranty on the finish since it is chemically inert.
 

Flying Tivo

Well-known member
Jan 24, 2017
1,108
Monterrey, NL, Mexico
The Aquabright might not matter for the chemistry, but for your SWG and equipment you do need to control your CSI. Your pool wont care if you have 350CH and let the ph go up to 7.8, dont bring it down until it reaches 8 and add MA for 7.8 not lower. your CSI should be around -0.05

Felipe
 

Flying Tivo

Well-known member
Jan 24, 2017
1,108
Monterrey, NL, Mexico
-0.58 is still low and outside TFP recommended parameters. It's your pool but you will still have more scaling on your swg. remember a csi closer to 0 is better or slightly negative. If you haven't downloaded the pool math app you should!
 

benm2010

Well-known member
Mar 16, 2017
143
Fort Worth, Texas
-0.58 is still low and outside TFP recommended parameters. It's your pool but you will still have more scaling on your swg. remember a csi closer to 0 is better or slightly negative. If you haven't downloaded the pool math app you should!
I definitely have the pool math app, and I agree everyone should have it! My impression from this site is that -0.6 to 0.6 (with -0.6 to 0 being ideal for SWG) is within range for CSI so -0.58 would be withing that range. Low CSI could cause damage to my grout line by absorbing calcium, but a negative CSI will not cause scaling (which is what I'm actually much more concerned about since I have a SWG). I will almost certainly continue to raise CH close to 300, especially as the water will be getting colder, but I like initial target CH of 200 and then slowly bump it up unless something in this post is incorrect.