1 year old Pentair Cartridge filter .. deteriorating

Dave C In Ontario

Well-known member
Feb 16, 2021
48
Courtice, Ontario, Canada
Pool Size
13400
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Good afternoon..
I have a Pentair cartridge filter.
The builder installed the pool last spring, so these filters are just one year old now.
I was going to open the pool for the season soon, so i opened up the the filter to clean the cartridges and noticed all the tops and bottoms of the each cartridge deteriorating..there is blue particles that easily come off.
It certainly doesn't look right.. I did read another post and someone mentioned high PH .. but if you look at my pool logs from last summer, you'll notice I really never had a PH issue... near the end of the season after being stable, it kept going up .. but nothing a little MA didn't easily handle. I tested 4 -5 time a week at least.
I test with 2006C Taylor kit.
All of last year ( because of the supply issues) I didn't run my SWG.. so was just doing daily doses of liquid chlorine.

Recently I did take my spa water sample in to be tested, and they reported my Ph was fine ( as well did my spa - self test), but the ph drop test was reporting a little high.. I bought a new bottle of Ph and compared the 2 bottles results.. and they reported the same ..
 

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Rancho Cost-a-Lotta

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Apr 10, 2018
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Rancho Cucamonga, CA
Pool Size
18375
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CircuPool RJ-45
Just an observation...each of the cartridges shows damage in the same location, probably where the manifold was resting.

I was searching for thread from last year in which the OP had alternated between two sets of cartridges but only one set showed damage. I believe the OP contacted Pentair for a warranty claim. I can't find the thread now.

A couple other similar posts:
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
27,584
Bedford, TX
Dave,

We have seen several of these filters plumbed backwards and I was hoping to get lucky.. :mrgreen:

But your filter is plumbed correctly. :goodjob:

I have no idea what is causing your problem, but doubt pH being a little high would cause and issues.

Do you add your liquid chlorine to your skimmer or in front of a working return?

Did you or your pool builder dump in any "magic" chemicals?

Let's see if Matt can tell us what might cause that plastic to degrade. Calling @JoyfulNoise

Thanks,

Jim R.
 

Dave C In Ontario

Well-known member
Feb 16, 2021
48
Courtice, Ontario, Canada
Pool Size
13400
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Dave,

We have seen several of these filters plumbed backwards and I was hoping to get lucky.. :mrgreen:

But your filter is plumbed correctly. :goodjob:

I have no idea what is causing your problem, but doubt pH being a little high would cause and issues.

Do you add your liquid chlorine to your skimmer or in front of a working return?

Did you or your pool builder dump in any "magic" chemicals?

Let's see if Matt can tell us what might cause that plastic to degrade. Calling @JoyfulNoise

Thanks,

Jim R.
I would need to add anywhere from 2 cups to 4 cups of chlorine.. I would slowly pour a quarter of what ever amount in front of each return ( I have 4 ).. reach out as far as I could as to not splash the walls.
 

Dave C In Ontario

Well-known member
Feb 16, 2021
48
Courtice, Ontario, Canada
Pool Size
13400
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Dave,

We have seen several of these filters plumbed backwards and I was hoping to get lucky.. :mrgreen:

But your filter is plumbed correctly. :goodjob:

I have no idea what is causing your problem, but doubt pH being a little high would cause and issues.

Do you add your liquid chlorine to your skimmer or in front of a working return?

Did you or your pool builder dump in any "magic" chemicals?

Let's see if Matt can tell us what might cause that plastic to degrade. Calling @JoyfulNoise

Thanks,

Jim R.
Also.. The pool company closed the pool for me last year.
Here is a picture of the bottles I found in my skimmer this spring..
20220509_105844.jpg
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
27,584
Bedford, TX
Dave,

I don't know squat about closing a pool.. But, when they add this stuff is the pump still running? Do they remove the cartridges after the pool is closed or do they sit and stew in it all winter?

Thanks,

Jim R.
 

Dave C In Ontario

Well-known member
Feb 16, 2021
48
Courtice, Ontario, Canada
Pool Size
13400
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Dave,

I don't know squat about closing a pool.. But, when they add this stuff is the pump still running? Do they remove the cartridges after the pool is closed or do they sit and stew in it all winter?

Thanks,

Jim R.
They're not really here long enough for the pool to be running for very long.

The Algaecide could have been added when they arrived, they had to install a safety cover so they were here longer then it normally would take .. so I want to say it could have had 2 hours to circulate.
But I didn't see them actually add it .. so i can't say for sure.
Then the pool is drained down about a 8 inches. ( usually more, but I have a baja/tanning ledge and they wanted to water to be higher for liner reasons.
Filter and pump are emptied ( drain plugs ), and RV anti freeze is added to the pump and lines after they are blown out / airlocked (floor drain).
SWG is removed and stored indoors.
I asked the pool company if the cartridges are good to be left in the filter during winter and they said no problem.
 

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mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
51,245
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Did they clean the cartridges when winterized? What did the cartridges look like at that time?
 

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
21,377
Tucson, AZ
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Looks like freeze/thaw damage to me. No, cartridges should not be left outdoors to freeze. The chemicals added wouldn’t do much harm.

Get Pentair to replace them under warranty and close your pool yourself. That way you know exactly what is going on and you save yourself A LOT of money.
 

Dave C In Ontario

Well-known member
Feb 16, 2021
48
Courtice, Ontario, Canada
Pool Size
13400
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Looks like freeze/thaw damage to me. No, cartridges should not be left outdoors to freeze. The chemicals added wouldn’t do much harm.

Get Pentair to replace them under warranty and close your pool yourself. That way you know exactly what is going on and you save yourself A LOT of money.
I wasn't sure the warranty would cover it, but I will ask the pool company...
I purchased a safety cover from the pool company, and had the close for free as part of the install.
 

Newdude

Mod Squad
Gold Supporter
TFP Guide
Jun 16, 2019
18,139
NY
Looks like freeze/thaw damage to me. No, cartridges should not be left outdoors to freeze
*wet cartridges.

If they blew the system and walked away, they never dried and the water expanding when it froze blew them out identical to backwards plumbing.

Mine took a full week to dry outside of the filter, with a needed flip, upside down, mid week.

Once dry as a bone they went back in the filter and stored in my (cold) outside garage and did fine.
 
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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
21,377
Tucson, AZ
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
I wasn't sure the warranty would cover it, but I will ask the pool company...
I purchased a safety cover from the pool company, and had the close for free as part of the install.

You should be able to call Pentair directly. They’ll probably need model and serial numbers for all the equipment. You can try with the pool company but I honestly wouldn’t trust them.
 

JamesW

TFP Expert
Mar 2, 2011
32,427
Some possibilities:

1) Mice chewed on the edges. The damage is limited to specific spots with the other areas looking untouched, which indicates an attack concentrated to the bad areas.

2) Some people use a pressure washer to clean cartridges and they might have hit those spots with too much pressure.

3) The tops look oily, which might indicate that maybe they were sat in some sort of oil for some reason. Oil can break down rubber compounds.


Cartridges.jpg
 

Dave C In Ontario

Well-known member
Feb 16, 2021
48
Courtice, Ontario, Canada
Pool Size
13400
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Thanks for your input ..
Take away...
1. Clean filters in fall.
2. Filters in the house for winter.
*wet cartridges.

If they blew the system and walked away, they never dried and the water expanding when it froze blew them out identical to backwards plumbing.

Mine took a full week to dry outside of the filter, with a needed flip, upside down, mid week.

Once dry as a bone they went back in the filter and stored in my (cold) outside garage and did fine.
This .. makes sense ..it was getting very cold before they closed the pool .. again .. supply issues for the cover..
 
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Dave C In Ontario

Well-known member
Feb 16, 2021
48
Courtice, Ontario, Canada
Pool Size
13400
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Some possibilities:

1) Mice chewed on the edges. The damage is limited to specific spots with the other areas looking untouched, which indicates an attack concentrated to the bad areas.

2) Some people use a pressure washer to clean cartridges and they might have hit those spots with too much pressure.

3) The tops look oily, which might indicate that maybe they were sat in some sort of oil for some reason. Oil can break down rubber compounds.


View attachment 408236


No oil .. just a little wet and the lighting making it look that way.
Mice.. maybe .. I did plug my plumbing with rubber value stops where I removed the SWG .. just to keep them out of the pipes.. didn't want one building a nest or dying in there!
But the damage is on the bottom of all ..and the top of all ..and only one spot on each .. I am starting to think freeze damage is the issue.
 

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