Buildup on SWG

ibseanb

Member
Jul 26, 2021
21
Ohio
I've been battling low FC all summer. I thought I had it under control, but again, the FC wont stay up FC info here . I keep adding liquid shock every other day even with the pool cover closed and no bather load. Still planning a SLAM in a few weeks once the weather gets to be where nobody wants to use the pool.

I took a pic of my SWG, I never noticed how much crud has accumulated on it. Could this be a possible culprit? Suggestions?

PXL_20210901_160957757.MP.jpg
 
Last edited:

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
27,872
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
That crud is scale on your cell plates which blocks chlorine generations. So your cell output is a fraction of its capacity.

The likely cause is poor water balance. Specifically a high CSI.

You need to clean your cell. See pages 17-18 in https://www.platinumpoolservice.com...ine_Generating_Systems_320_540_760_Manual.pdf

You have your own test kit? If so post your water chemistry in the form...

FC
CC
pH
TA
CH
CYA
SALT
Water Temp




 

BowserB

Silver Supporter
Jul 29, 2018
575
Katy, Texas
Side note. That clear cell body is a great idea. You don't need to take it apart to see that it doesn't need--or in your case does need--to be cleaned! Hey Pentair, I have an idea for your next gen IntelliChlor!
 

ibseanb

Member
Jul 26, 2021
21
Ohio
That crud is scale on your cell plates which blocks chlorine generations. So your cell output is a fraction of its capacity.

The likely cause is poor water balance. Specifically a high CSI.

You need to clean your cell. See pages 17-18 in https://www.platinumpoolservice.com...ine_Generating_Systems_320_540_760_Manual.pdf

You have your own test kit? If so post your water chemistry in the form...

FC
CC
pH
TA
CH
CYA
SALT
Water Temp




Thank you for the reply. For some reason I didn't get the notification.

My last readings were:

Pool Temp 83
FC 4.4
CC .4
PH 7.4
ALK 200
CYA 30
CH 90
Salt: 5200 (this may be bad).

The pool calculator says to replace 100% of the water. That seems a bit overboard.

Thanks,
Sean
 

JimMarshall

Gold Supporter
TFP Guide
Jun 5, 2017
1,074
Oil City PA
Your CYA is WAY low for a SWG pool. this is one of the reasons that your FC won't stay. Nothing about those readings says " replace 100% of the water". Are you sure that you have the right target amounts listed?

You will need to replace some water to drop that salt level.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
27,872
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Pool Temp 83
FC 4.4
CC .4
PH 7.4

That's all good.


A bit high. I am surprised you have a pH of 7.4 with a TA of 200.


CYA should be more like 50-70 with a SWG.


If you have a plaster pool you need to raise your CH to 300+.

Salt: 5200 (this may be bad).

Manual says salt should be 4000-4500. How are you measuring the salt?

The pool calculator says to replace 100% of the water. That seems a bit overboard.

I don’t see why you need to do that. You do need to drain about 20% of your water to get your salt down if the 5200 is accurate.

Your CSI calculates to -0.52 and I would be concerned about your pool water being agressive to your plaster and grout and etching it.

See...

 
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ibseanb

Member
Jul 26, 2021
21
Ohio
HI Allen, thanks for the reply.

The Alk levels are high I'm guessing because of all the chlorine shock I've been dumping in. The salt level was given to me by the pool store, when I took it in a few months ago. I have a Taylor 2006 test kit that did not have the salt components. We haven't added or removed water or salt since then, so I'm guessing its accurate.

I bought some muriatic acid to lower the PH and ALK to do the SLAM. I've been holding off and limping along until it starts to cool down a bit before doing that.

I have a fiberglass pool, not plaster. Do you think the build up on the SWG is enough to have an effect on its output? I'm going to clean it up tonight
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
32,960
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Sean, the high TA has nothing to do with the chlorine. TA is often elevated in your region of the country, just something that comes down over time with acid. You can get a Taylor K-1766 for next season to confirm your own salt levels. Be sure to update your signature with all of your pool and equipment info. See ours as examples. Go to SETTINGS, then look again under SETTINGS and SIGNATURE. If you have any questions or problems let us know.
 

ibseanb

Member
Jul 26, 2021
21
Ohio
Well, I cleaned the cell according to the manual you linked above, and it was too easy. I reinstalled the cell in the same orientation as my picture above and cranked it up. After a few minutes, the air disappeared from the housing and all looked good. I looked at the panel, and the Service light was illuminated. The pic above does not show that being the case, so something changed. I turned it off, and back on. The service light went off and tiny bubbles appeared around the cell, seemingly from the chlorine being generated. Great.

I checked a few hours later, and the service light is back on. I can't imagine I did something to screw that up. All I did was turn everything off, unscrewed it and cleaned it with a wooden stick and put it all back together. Any thoughts?

Thanks.
 

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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
27,872
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
What is the pool water salt level?
 

ibseanb

Member
Jul 26, 2021
21
Ohio
I didn't use acid, the manual says not to, to only poke it with a wooden stick. The last salt reading was 5200. I'll have it retested, but the bottom of the SWG shows recommended 3000-5000 but 3000-32000 max.

I went out to check on it a few minutes ago, sure enough no bubbles and the service light was on. Instead of turning it off/on, I reduced the level from BOOST to 100%. The service light went off, bubbles appeared, then the service light came back on.
 

jtpipkin

Bronze Supporter
Oct 2, 2016
323
albany, ga
just thinking out loud here, the Breeze system I looked up was rated for 10,000 hours. At 8 hours a day that would mean roughly 3.5 years. Yours is about 5 years old. Maybe the cell is dead, or dying?
 

ibseanb

Member
Jul 26, 2021
21
Ohio
Good thought. The pump runs 24 hours a day on low, and the swg is always on. When we opened the pool this year, I set it on Boost and left it. I took the sample to the pool store and the FC was through the roof. They had to add a dechlorinator to the sample to bring it down to read other chemical levels. I remember joking that 'at least the SWG works!'.

About halfway through the summer, we had a pool party. I closed up the pool not thinking about it for a few days. Upon reopening the cover, I had a swamp. I figured the SWG couldn't keep up with the demand due to the high bather load. From then on, I couldn't keep chlorine in the pool.

On the linked thread in my original post, it was assumed that I had some algae that wouldn't die, and a SLAM was in order. I've limped along by adding shock once or twice a week until I could dedicate a week to the SLAM.

Would it be worth dipping it in some muriatic acid to see if that does anything?
 

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