CSI Question

[YouRang]

Just tested my pool and thought my levels were good until I hovered over my CSI calc of -.36..."Potential to become corrosive to plaster"

Say what?

24000 gallon pool, in ground, plaster, pebble tech pool deck, SWG, cartridge filter. What am I doing wrong here? Here are my levels:

FC 5
CC 0
TC 5
CH 350
pH 7.5
TA 60
CYA 60
Salt 3000
Bromates 0
88*

 

[Richard320]

Let pH climb a little or raise TA.

If you want immediate results, a 4 lb box of baking soda will take TA up to 70 and drop CSI to -.25

 

[YouRang]

Thanks Richard. Just found that while adjusting the calculator. Borax will raise pH as well, correct?

 

[Texas Splash]

Borax for pH rise - yes. Good you noticed the CSI row. Now that you have you'll always key-in on it. That's good.

 

[YouRang]

A touch of panic, but yes, I always check the CSI row. I've noticed 2 areas of discoloration in the shallow end and near my drain. I wonder if the plaster corroded in those areas? This is my 2nd year on TFP, so I'm still a newb to this!

 

[Richard320]

Thanks Richard. Just found that while adjusting the calculator. Borax will raise pH as well, correct?

Yes, but baking soda is easier to find late on a Sunday afternoon.

 

[YouRang]

Yes, but baking soda is easier to find late on a Sunday afternoon.

Agreed. I've been running my waterfall regularly trying to get the pH up too. I got a little carried away with the muratic acid. I chased my TA all summer last year so i was trying to avoid chasing my TA all summer again. I tested it last night with an old Leslie's kit and had TA of 130, so either last night is wrong or tonight is wrong. I tested twice tonight, so I'm sure TA=60 is correct.