cya and swg

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
42,043
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Your signature does not show a SWCG? Do you have one?

The CYA range for pools with a SWCG is 60-90. In your climate, 60 or 70 ppm should work fine, IF you have a SWCG.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
42,043
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Great. So, is your water clear? No loss of FC overnight?
If so, time to switch to maintenance. Add enough CYA to get to 70ppm in the pool water. Adjust your FC target to that shown in FC/CYA Chart and make sure our SWCG is generating enough FC each day to keep it at or above the target FC.

Recommended Levels
 

adl6009

Well-known member
Mar 19, 2015
60
Long Island, NY
I was maintaining cya of 30. Maybe thats why I had cloudy water yesterday. I am in the 2nd day of slamming the pool. I had an overnight drop of 3ppm. So my plan is to slam until done, then restart the swg and then increase cya to 70. Thing is if you look at the chart to slam the levels for cya called for a swg are out of the range for slamming a pool. What do you do if the cya is 70 and you have to slam? Why is the cya so high for a swg? Thanks.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
42,043
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
What do you do if the cya is 70 and you have to slam? Why is the cya so high for a swg? Thanks.
If you are following the SLAM Process, by definition, you are not using your SWCG, so the FC/CYA chart you follow is for Liquid Chlorine.

The CYA is higher for a SWCG as that device adds the chlorine slowly over a long period. The higher CYA protects the FC better from the sun when it is being added in that way.
 

adl6009

Well-known member
Mar 19, 2015
60
Long Island, NY
How fast can I add the cya. I have to add 7 lbs of the granular cya. I have done the sock method in the past, took a whole day or more. I also put it in a knee hi nylon, maybe a little faster. When I used hth pods, the sack disintegrated real fast, maybe 20 minutes, and all the cya was in. Right now I put about 2 lbs in a skimmer sock and put the pump on 3000 rpm. I also put the filter on recirculate so as to not trap any in the filter medium. What do you think?
 

clambert1273

Gold Supporter
Jun 13, 2013
1,110
Gilbert, AZ
Pool Size
12000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool Edge-40
The sock and knee hi's are the best imo, I add to knee hi and put it in front of return after about 30 min, i can squeeze it all out in about 10-15 min
 

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