Completed 2/3 drain, CYA down to 100.

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6genet

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May 24, 2014
2
Maryville, Tennessee
Long story short, Wife was having problem with Algee, I ran the test on the Taylor K-2006 and found CYA was literally off the charts. At the 1.8 mark on tube I lost the black dot. i just finished draining and refilling 2/3 of the pool and the latest test comes in right at 100. I can't say I'm surprised.

I just got the water level back to normal, these are the initial readings.
FC - 1.2
PH - 7.0
TA - 70
 
Followed jblizzle's advise and did another 50% drain. CYA is down to 60, that seems manageable and I can work with that. After the pool was filled, adjusted Total Alk to 100, and PH is 7.4. Water is clear.

I used 4 1-lb. bags of Cal-Hypo and free chlorine is now 10. Combined chlorine shows zero. Not at the poolmath SLAM level but at least we have working chlorine again. I also have 2 1-gallon jugs of 10% sodium hypochlorite. My next questions is can I add the sodium hypoclorite in with the cal-hypo to bring the pool to SLAM level, or should I just stick with the Cal-Hypo? Thanks all.
 
You can add the liquid. The prohibition on mixing forms of chlorine is generally in a confined space or in the pool quickly together. Th CalHypo you added should be well mixed now, so you can add other chemicals including liquid chlorine.
 
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