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How to repair crack in pool filter
Posted on 6/8/25 at 6:15 pm
Posted on 6/8/25 at 6:15 pm
I have a hairline crack in the wall of my pool cartridge filter. I’ve tried to repair it with Flexseal, flextape and JB weld to no avail. I thought for sure the JB weld would work but it wouldn’t adhere to the filter wall. Any suggestions of other fixes? Really don’t want to have to dish out $2k for a new filter.
10
Posted on 6/8/25 at 6:53 pm to LSUlove
Maybe someone has a better answer, but isn’t it pressurized? Can you trust a fix on this? My guess is you need to get a new filter so nothing goes wrong.
Posted on 6/8/25 at 8:07 pm to LSUlove
Uncle used flex seal around 2 years ago
Posted on 6/8/25 at 9:16 pm to LSUlove
A picture would help immensely.
Plastic welder might get it.
Plastic welder might get it.
Posted on 6/8/25 at 9:27 pm to LSUlove
What kind of filter? You will probably spend more on trying to fix it than a new one.
Posted on 6/9/25 at 5:26 am to LSUlove
Same thing happened to me, had a Pentair Filter housing that had a HAIRLINE crack in the threads of the Inlet. After years of being abused by the sun, the fiberglass gets weak. It made sense to replace the entire housing, there was no fixing it due to its location and the system being pressurized.
Posted on 6/9/25 at 7:13 am to GeauxHead337
You can fix a cracked cylinder sometimes with some sheet mental and hose clamps and 3m 5200. A cracked filter head is nearly impossible to fix permanently.
Posted on 6/9/25 at 8:33 am to LSUlove
You say JB would not adhere. Did you "rough up" your surface as prep for the JB? Seems as though JB would adhere as long as it wasn't applied to a slick surface. Just a thought.
Posted on 6/9/25 at 9:00 am to LSUlove
I think you’d use a resin or epoxy and roll fiberglass mats on one at a time.
Don’t have to spend $2k. Check offer up, CL, marketplace, etc.
same filter housings are generally used shared amongst several sizes w different heads and same for DE and cartridge so compatibility is pretty high or at least it used to be.
Ours is 20+ years old and used to splinter so we spray it with a UV resistant clear coat every year or two. More to not make me itch when working around it but maybe make it last longer too.
Don’t have to spend $2k. Check offer up, CL, marketplace, etc.
same filter housings are generally used shared amongst several sizes w different heads and same for DE and cartridge so compatibility is pretty high or at least it used to be.
Ours is 20+ years old and used to splinter so we spray it with a UV resistant clear coat every year or two. More to not make me itch when working around it but maybe make it last longer too.
Posted on 6/9/25 at 9:02 am to LSUlove
Posted on 6/9/25 at 9:22 am to LSUlove
quote:
Flexseal, flextape and JB weld
Those are all crappy retail products. Get some 3M 2 part repair. Grind the crack into a V shape like you'd prep for a weld on metal.
If it can hold a car together at 70 mph, it should work on your pool filter.
The product costs around $60 and the 2 part gun to apply it is probably another $100.
If you have a friend who works in a body shop, they probably already have some. Might even be worth bringing it to a smaller independent body shop and paying them to fix.
Posted on 6/9/25 at 9:36 am to Shexter
quote:
3M
3M 5200 or 4200 would also work I have to assume. A picture would help here OP. 5200 is a firm underwater sealant OP and 4200 is more flexible. I’ve never tried on plastic but I can’t imagine they wouldn’t work. It’s not cheap in regards to sealant goes a small tube will be $20 but much cheaper than a new one. I think it sticks to damn near anything
Posted on 6/9/25 at 10:51 am to LSUlove
I had a similar problem 10+ years ago and had to replace it since it was pressurized.
I upgraded from a plastic to a fiberglass shell and haven't had any problems since.
I upgraded from a plastic to a fiberglass shell and haven't had any problems since.
Posted on 6/9/25 at 11:05 am to Dallaswho
Please do not buy any all in one solution. There are 100 common plastics out there and each requires a different solution to correctly bond.
ABS requires ABS dissolved in acetone, PVC requires PVC cement, thermoplastics require heat.
Fiberglass requires adding layers of resin and glass matting to build up the fiberglass. Bondo liquid resin and Bondo fiberglass mats would be the best Walmart solution.
ABS requires ABS dissolved in acetone, PVC requires PVC cement, thermoplastics require heat.
Fiberglass requires adding layers of resin and glass matting to build up the fiberglass. Bondo liquid resin and Bondo fiberglass mats would be the best Walmart solution.
Posted on 6/9/25 at 12:32 pm to GeauxHead337
quote:
After years of being abused by the sun, the fiberglass gets weak.
I built a cover over all of my pool equipment 10 years when the pool was installed and honestly my pool equipment looks very similar to when it was installed. The sun is absolutely brutal on this type of equipment. Really encourage people to think about a way to place shade over your pool equipment.
Posted on 6/9/25 at 5:29 pm to baldona
quote:it does not. Both 5200 and 4200 require a roughened surface to bond. Anything slick like plastic or aluminum or similar will not adhere. Those products are best used as fillers not adhesives
I think it sticks to damn near anything
Posted on 6/9/25 at 6:49 pm to Dallaswho
Thanks for the advice.
This is my next try tomorrow. Filter is only 3 years old and does not get direct sunlight where it is located. The area of the crack gets zero Sun. I’m guessing it was probably defective somehow.
I’ve considered replacing just the bottom part of the housing which holds the crack, but I was quoted half of a new filter. Just don’t want to end up with something not working on the rest in the next year or so and now I’ve pieced and parted it together and have to dish out for a full new one.
It is pressurized but you would still think something would work. Fingers crossed the fiberglass repair kit does the trick. I’ll see if I can grab a photo tonight when I get home.
quote:
Fiberglass requires adding layers of resin and glass matting to build up the fiberglass. Bondo liquid resin and Bondo fiberglass mats would be the best Walmart solution.
This is my next try tomorrow. Filter is only 3 years old and does not get direct sunlight where it is located. The area of the crack gets zero Sun. I’m guessing it was probably defective somehow.
I’ve considered replacing just the bottom part of the housing which holds the crack, but I was quoted half of a new filter. Just don’t want to end up with something not working on the rest in the next year or so and now I’ve pieced and parted it together and have to dish out for a full new one.
It is pressurized but you would still think something would work. Fingers crossed the fiberglass repair kit does the trick. I’ll see if I can grab a photo tonight when I get home.
Posted on 6/9/25 at 8:02 pm to LSUlove
I don’t know good of a job it would take to hold pressure. I’d check Craigslist marketplace and offer up before attempting a repair then check YouTube to make sure I was doing it right.
I’ve only repaired an ABS RV tank in layers and that’s like 0.7 PSI, not 25-30.
I’ve only repaired an ABS RV tank in layers and that’s like 0.7 PSI, not 25-30.
This post was edited on 6/9/25 at 8:11 pm
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