Low CSI on AquaBright finish

[benm2010]

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]

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

 

[mknauss]

If your water tile has cement based grout it would be wise to raise your CH a bit and keep your CSI less negative.

 

[benm2010]

Thanks, I'll add CH to get closer to 200 which will give a CSI higher than -.6.

 

[Flying Tivo]

What do you think the difference between 200 or 300 is going to do??

 

[benm2010]

What do you think the difference between 200 or 300 is going to do??

Very little, but I see little point in shooting for a higher CH value when I cannot remove calcium from the water. Shoot for 200, continue to monitor it and add as necessary since this will put my CSI at -.58.

 

[Flying Tivo]

-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]

-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.