CYA level and SWG

Aug 20, 2011
17
0
#1
I have an SWG and an outdoor pool with full sun along the whole day, usual temperture range is in the 90's
The recommended CYA level in the SWG manual is 40 ppm.
I read here that the recommended level is 70 ppm.
Can someone shed some more light on this topic?
Thanks,
Avi.
 

jblizzle

Mod Squad
LifeTime Supporter
TFP Expert
May 19, 2010
41,193
4
Tucson, AZ
#2
Higher CYA levels better protect the low levels of FC generated by the SWG from the sun.

More info is available in pool school articles.

Posted with Tapatalk ... sorry if I sound short ... hate typing on phone ;)
 

MikeInNH

Well-known member
Sep 26, 2007
476
0
Southern NH
#3
My Intex SWG lists lower than recommended CYA also. I went with 50ppm's, my unit has no issues keeping the FC at a constant by running 4 hours a day in my 18'x33' pool. 3.5 hours would be optimal but it only does 1 hour increments. My pool is almost always covered so that also helps keep it up too. I just test a few times a week and adjust the time up or down as needed.
 

stevodevo

LifeTime Supporter
Dec 22, 2011
57
0
Gold Coast, Australia
#4
The main reason, as I understand it, for the higher recommended CYA levels on this forum is to reduce pH rise. Having more CYA means you can reduce run times on the SWG, and by reducing the associated aeration (as the water flows through the cell) it helps contain pH rise.
 
#5
I haven't kept my CYA at 70 this year either and am keeping up with the chlorine demand w/5-6 hours a day. I tend to keep my chlorine on the higher side of normal too. You can try to run at a lower level and see how much you are running your swg and go from there. You can always add more cya, but removing it... what a pain!
 

stevodevo

LifeTime Supporter
Dec 22, 2011
57
0
Gold Coast, Australia
#6
sorry... probably not 'run time' speaking technically because run time is more determined by filtration needs. I mean chlorine output percentage on the SWG which determines the time the SWG is generating chlorine. More CYA means less chlorine loss an less chlorine demand.
 

stevodevo

LifeTime Supporter
Dec 22, 2011
57
0
Gold Coast, Australia
#7
Like suziqzer says, I'm actually running at about 50ppm CYA and only running the SWG 4 hours a day on the lowest pump flow an the lowest SWG output and everything is perfect. It winter here and the small pool is getting no use, but the point is you don't HAVE to have 70ppm... just monitor things and adjust accordingly
 

MikeInNH

Well-known member
Sep 26, 2007
476
0
Southern NH
#9
JasonLion said:
The lower your CYA level, the shorter the cell lifetime will be.
Intex says a lower number, maybe so it won't last as long...I don't know. It's cheap enough to replace it after a few years. These little guys are on or off, no percentages here.