New pool owner - CYA levels with SWG

Lagunas2k

New member
Feb 14, 2021
4
Southern California
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
Just fired my pool guy after six months. Bought myself a Taylor kit and just jumping right in. Thanks for all of the info so far everyone.

Here are the basics:
15,000 Gallon - Mini-pebble, plaster pool. In Ground Pool and Spa, small baja.
Salt water generator and VSP pumps

My PH was at 8, so put in two cups of Muriatic Acid.
My FC levels were at 2.1 - Running my SWG for 8 hours at 60% - Just bumped it up to 65%
VSP is set around 2500 RPM

TA has been about 80-85 most of the summer
CH is 428
CYA was 31 on the last reading
Salt is at 2500 PPM

I picked up some salt to bring the Salt up to 3000.

My main question is regarding CYA. Everything I read says the CYA levels should be around 75 for a SWG, but then my FC levels should be higher around 3-4 according to the chart on TFP.
If I'm at 31 right now, do I need to raise it? If so, by how much? TFP also suggests my FC should be at a 3, not higher than that.
I'm in Southern California and my pool gets sun nearly all day. Usage and bather loads are generally low as we use the pool maybe once a week.

My pool guy primarily put in acid and maybe what looked like a conditioner or stabilizer once in a blue moon. Otherwise our pool has been crystal clear and algae free since inception.
 
Last edited:

RoyR

Bronze Supporter
Jul 31, 2018
380
Escondido/CA
Follow this chart…3000 for Salt is good, going to creep up over time and the only way to lower it, is to do a water exchange. Add the details of your pool in your signature…

 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
40,915
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
My main question is regarding CYA. Everything I read says the CYA levels should be around 75 for a SWG, but then my FC levels should be higher around 3-4 according to the chart on TFP.
If I'm at 31 right now, do I need to raise it? If so, by how much?
Ideally yes. Your SWG is working too hard to make chlorine while the sun steals it. We recommend a CYA of 70, or at least 60 as we approach potentially cooler months.

TFP also suggests my FC should be at a 3, not higher than that.
Where did you see that? Perhaps you mean no "lower" that 3 ppm? We always refer to the FC/CYA Chart.

While your CYA should be higher, I would first be sure you have no potential signs of algae before increasing it. Do an Overnight Chlorine Loss Test first. If you pass, then increase the CYA to at least 60-70. If you fail the OCLT, the do a SLAM Process.

Let us know if you have any other questions.
 

Lagunas2k

New member
Feb 14, 2021
4
Southern California
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
Where did you see that? Perhaps you mean no "lower" that 3 ppm? We always refer to the FC/CYA Chart.

While your CYA should be higher, I would first be sure you have no potential signs of algae before increasing it. Do an Overnight Chlorine Loss Test first. If you pass, then increase the CYA to at least 60-70. If you fail the OCLT, the do a SLAM Process.
Thanks for the info. I was under the impression the range was supposed to be 1-3 for FC, but if there is no harm in going 3-4 then it makes a lot more sense.

I'll start with these and see how things go. Thank you.
 
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