Pentair check valve flaps “dissolving”. Is this a common problem?

[Rickster1]

My salt water pool has five Pentair check valves and one Jandy check valve.

The pool is 14 years old. The Jandy valve has never been replaced and looks and works fine.

The Pentair valve flappers only seem to last about three years. And cost like $75 - $130 each, and I need five each time.
(this year, I replaced them with aftermarket flaps. We’ll see how long they last.)

The flappers on the Pentair valves flapper seals disintegrate into gross monstrosities of gooey white stuff that almost looks scary. Photos attached.

I‘ve contacted Pentair about this several times since the first time I replaced them about 12 years ago.
I’ve sent them pictures. I’ve sent them links to Amazon reviews with pictures just like mine. I even sent them a valve flap.
They continue to tell me that I’m the first they ever heard of it…

It can’t be that hard to replace the rubber with something actually compatible with pool water.

Since they tell me they’ve never heard of this problem, I was hoping to hear from others. Is it really just me?

~ Rick

 

[JamesW]

Do you use tabs?

Can you show the system?

 

[trivetman]

Ew

 

[DavidArmenB]

Fascinating

 

[DavidArmenB]

Do you have the ability to post full test results?

 

[Rickster1]

Do you use tabs?

SWG
IntelliChlor-40

Can you show the system?

 

[Rickster1]

Do you have the ability to post full test results?

Ph 7.7
Cl 2.0
TA 75
Cya 70
Ch 500
Salt 3600

 

[JamesW]

The damage is probably from chemicals.

 

[DavidArmenB]

Ph 7.7
Cl 2.0
TA 75
Cya 70
Ch 500
Salt 3600

This doesn’t answer your original question but chlorinating with a SWCG when the pool has a CYA concentration of 70ppm requires you to maintain a minimum Free Chlorine concentration of 3ppm, with ideal FC levels being 5 to 10ppm.