Hello I drained and refilled my pool about 7 months ago because i had high CYA readings. Since then Ive only used chlorine bleach, Ph reducer and chlorine tablets in the floater. My concern is that my CYA is high again. Does this occur naturally? I do have flag stone around the pool and we sometimes get dust storms, could that be it?
Does CYA go up naturally?
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- Start date
No it does not naturally rise. It is in the tablets that you were using. They are made of Trichlor. Check out some of the articles in pool school.
A little more info...
Pool size is 10000 gal non salt water
Calcium hardness 625
TA 140
CYA 80
Chlorine 5 but decreases to 0 in about 5 days
Br 10 but behaves same as chlorine
Ph 7.8 but i constantly have to add pH reducer
I get these readings using the test kit recommended here
If i use a hth test stip my CYA reading is 150
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Thank you Jason. Are the floater tablets not recommended? If not what should I be using?
Pool size is 10000 gal non salt water
Calcium hardness 625
TA 140
CYA 80
Chlorine 5 but decreases to 0 in about 5 days
Br 10 but behaves same as chlorine
Ph 7.8 but i constantly have to add pH reducer
I get these readings using the test kit recommended here
If i use a hth test stip my CYA reading is 150
- - - Updated - - -
Thank you Jason. Are the floater tablets not recommended? If not what should I be using?
Just liquid chlorine.
And you should be testing and adjusting it nearly every day and never let the FC drop below the minimum required for your CYA level according to the [FC/CYA][/FC/CYA]
And you should be testing and adjusting it nearly every day and never let the FC drop below the minimum required for your CYA level according to the [FC/CYA][/FC/CYA]
Oh and ignore Br. That is just a different scale if you were using bromine.
Do you have the drop based chlorine test that's in the recommended test kits?
Do you have the drop based chlorine test that's in the recommended test kits?
Yep sure do. I dont have a current reading though. I just added bleach an hour ago so I'll let the water mix overnight and test in the morning. Thx
Sorry I am gonna highjack your thread.
Quick background :
The previous pool owner and I have been using tablets for years.
Last month at pool opening CYA was to the roof and I had it back to 70/80 after emptying more than half the pool.
Was pretty stable but today it is showing 90... I guess there is a margin of error with this test (I try to always do it with the sun in my back, tube at hip height etc).
I recall having read somewhere that plaster pools could release some CYA if there has been a lot of CYA in the water for years.
Does it make sense or am I wrong here ?
I will try to retest tomorrow morning to make sure.
Quick background :
The previous pool owner and I have been using tablets for years.
Last month at pool opening CYA was to the roof and I had it back to 70/80 after emptying more than half the pool.
Was pretty stable but today it is showing 90... I guess there is a margin of error with this test (I try to always do it with the sun in my back, tube at hip height etc).
I recall having read somewhere that plaster pools could release some CYA if there has been a lot of CYA in the water for years.
Does it make sense or am I wrong here ?
I will try to retest tomorrow morning to make sure.
- May 3, 2014
- 59,666
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
CYA is only added, not created.
The CYA test is +/-10ppm at best using the 1:1 ratio of pool water/reagent.
I have some vague recollection of threads talking about the CYA being released from the plaster. Similar to how Calcium scaling could be redisolved and the calcium released.
But, I am not sure there was any truth behind it. If you can find any sources for this, please let us know.
But, I am not sure there was any truth behind it. If you can find any sources for this, please let us know.