CYA level is very low

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AmmarDaStar

0
Sep 14, 2015
15
Plano/TX
PH > 8.2 "did it at night with house light so I can be wrong"
CH 500
TA 150
CYA < 20

So my PH, CH and TA are high and CYA is low. I need to fix this. what is the best way to do it? I took a fast look at the pool calculator and looks like PH and TA are related/effect each other so I still don't get it. CH value seem high, double the recommendation. and my CYA is very low.

What is the best way to fix the pool? I have bought last year a lot of Chlorine pucks but never used them as I was told they will increase the CYA levels which were good last summer, now that my levels are low I am thinking of using them and keep testing for CYA until maybe it reach 35-40 then stop using them. I live in Plano, TX and the pool under the sun from 10:00 to 11:00am until the sun goes down. "gets lots of sun"

Thank you for your help/feed back
 
Welcome. To start, I would re-do all the tests with regular sunlight if possible. Lighting will definitely affect the pH and CYA tests. Assuming you retest and get similar values, you can use the pucks but I would recommend getting your CYA to at least 20 ppm first then switching to the pucks. Your TA isn't so bad and you can work that out later. CH is definitely high, but manageable. I am not too familiar with high CH and plaster issues, but others can help. If your pH is really that high as well as a high CH, you are very susceptible to scaling. My guess (hope) is that the lighting is throwing it off.

In general, how does the pool look now - clear, green, cloudy blue??
 
Thank you for the feed back. the pool looks good "clear water" but I was using lots of amounts of Chlorine, I have few cracks at the bottom of the pool. they are not new. but I am not sure if the are getting larger/longer.
I will re-do the PH and CYA but I doubt the CYA will change. The black dot was very visible as I filled up the tube all the way to the top
 
My pleasure, glad your pool is clear! Those pucks are tempting, I do the same thing, but CYA is pretty cheap too. I would add enough CYA to get to 20 or even 30, then go to the pucks. They just don't add it quickly enough to be effective with CYA at/near zero ppm. The CYA will definitely decrease your FC burn off. If you get that much sun, maintaining a CYA level of 50 may be feasible which could give you a decent window of puck usage. But I would save some room for vacations, etc. when you have to use pucks while away.
 
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