Switch from Pristine Blue to Chlorine

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chiefdanw

chiefdanw

0
Jul 12, 2017
9
Lapace LA
I am currently using Pristine Blue in my 24" AGB pool. The water is very clear. However, I have developed brown spots all over the bottom of the liner. Per PB I performed a "sock test". (Add a scoop of shock into a sock and place on the stain for 3 minutes) If the stain disappears it biologic. It does disappear. Current pool water chemistry as tested by a Taylor DPD test kit and a PB test kit are:
Chlorine: 0
pH: 7.8 (I recently added baking soda to raise akly that was at 40)
Alky: 80
PB: 0.3
How do I switch to chlorine as my sanitizer?
This happened last year also

IMG_1216 (1).jpg
 
Pristine blue contains copper, the use of which we strongly discourage due to its tendency to stain pool equipment and turn hair green.

Regardless of what your PB says, I wouldn't be surprised to learn that the copper is responsible for your stains.

I'll leave it to those more knowledgeable to discuss how to convert to chlorine. It may be as simple as just beginning to add chlorine bleach daily in place of your Pristine Blue and anything else you are using now. Or it could require a drain and refill. I have no experience with Pristine Blue, so I don't know, but someone here surely will.
 
Welcome! :wave:

It's pretty easy to switch. Just stop adding Pristine Blue chemicals. Get a test kit. Adjust pH with Acid. Measure the CYA level and then maintain the chlorine level using bleach according to this chart [FC/CYA][/FC/CYA] Does your test kit have a CYA test? You really really really need to know that level. Pristine Blue Extra contains dichlor, so if you've been adding a bunch of that, you've also been adding a bunch of CYA.

If the copper levels haven't gotten too crazy, you're done. You now have a bleach pool.

Now a note about your stain test. If that "shock" was Cal-hypo, then, yes, the stains are organic and a few weeks of adequate chlorine should fade them. If the shock was dichlor or trichlor, the results are not really conclusive. Both of those products are very acidic, so it could be that those are metal stains and the acid dissolved the metal back into solution.

The normal sequence to identify stains is to start with a Vitamin C tablet. Just a plain, generic Vitamin C tablet you might already have or can get from a health fiend friend or relative. It's a mild acid but it has no chlorine. So if the stain lifts with the Vitamin C, it's metal. If not, then you try the chlorine puck or powder.
 
Thanks so much for the fast replies. I used shock that is Sodium Dichloro-s - Triazinetrione 99% to test the stains. also yesterday I added 2 lbs of this shock and a floater with 1 1/2 tabs that contain Tricloro-s Triazinetrione. This morning i checked free chlorine using Taylor chems R-001 & R-002 and it is 2-4 on the comparator. Alky is 80 with a pH that has dropped from 7.8 to 7.2 since yesterday morning. I don't have the reagent to test Total Chlorine. PB is .3 and the stain appears to have lightened considerably. I just placed an order for a taylor K-2006 test kit. Am I OK to continue with the current chlorine level until the test kit comes in (supposed to be Sunday delivery from Amazon) and I can test for CYA? Is .3 on the copper OK for now?
 
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