Salt level high, CYA level low with an SWG

jsternberg

Member
Dec 10, 2020
13
Addison, TX
Hi,

I recently started maintaining a pool with an SWG. The plaster recently finished curing for the first 30 days so the pool builder added the salt so that the salt cell could be turned on. I've been using a test kit to manage the pool and knew based on the recommendations here that I would have to increase the CYA so yesterday I bought some solid stabilizer, introduced it by the sock method, then left the pump on overnight after leaving the sock in since the morning.

When I went to look at the panel today, I was surprised to find that the salt level had increased from 3.1 GPL to 3.7 GPL. I thought to myself, "Of course, the solid stabilizer must also contain salt to stabilize the acid."

I just tested the CYA again and I'm going to test it again tomorrow to ensure that the level is as expected. The value was 30 for CYA and it's now 50. My intention was to get it to 60 so I think that that's likely going to be the value I get when I test tomorrow. I was planning to add more to get to the recommended 70-80 range, but now my salt level is too high and the way to lower salt will also lower the CYA.

Did I do this in the wrong order when adding salt and CYA to the pool and how do I handle this situation? Do I need to replace the water to lower the salt and then replace the salt with more CYA since I will have lowered the CYA at the same time? If I have to do water replacement, how do I do that? I have an overflow drain but I don't have a pump to drain the water from the pool. If I were to run the hose to add water for 5-10 minutes once an hour, would this be enough to dilute the existing chemicals?

Thanks for any help.
 

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
14,686
Pleasanton, CA
Pool Size
20000
Surface
Plaster
Chlorine
Salt Water Generator
Is the SWG unit alarming and shutting down? If the current is below 8 amps, it should be ok and I would leave it alone. The salt will lower with splash out and rain overflow.
 

jsternberg

Member
Dec 10, 2020
13
Addison, TX
The SWG appears to be fine. I haven't heard it alarm out, but I still have to raise the CYA even more than I presently have so I know the salt level is going to climb more.
 

Saturn94

Bronze Supporter
Mar 11, 2015
1,273
SE Virginia
Pool Size
20000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
Keep in mind when adding salt, especially the initial large dose, it can take a few days for it to mix thoroughly and the SWCG reading to settle (assuming pump running 24/7 during this time).

I never seen CYA impact the SWCG reading.
 

SecoSteve

Silver Supporter
Jul 28, 2020
139
Lincoln University, Pa
Pool Size
25000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
I would not trust the Aquapure to give an accurate salt reading. I know that sounds crazy, but my Aquapure was reading higher salt as well. But, I used the K1766 salt test and also had a pool store test as well for comparison. The K1766 and pool store were close and where I thought it should be. There is a way to calibrate the Aquapure down the the realistic level, as long as you have a couple of independent tests verifying the salt level. You can find the procedure if you search on this forum.