Unicel C-8417 is blocking flow

[barryiwhite]

Hi all! I used to look after my pool myself but hired a pool company as I was spending a lot of time away from the property. We had to let them go after too many issues with pool going green etc. I am now at the property trying to get everything back in good working order again.

There were leaks in the pipework before and after the pump so I replaced all of that (like for like) and bought a new pump as it was getting pretty old. Everything circulates fine when I remove the cartridge filter but not when the cartridge is installed. The old pool company recently replaced the cartridge and it does look very new/clean. I also checked and it is apparently compatible with my filter. Can it really be the difference between a knock-off Unicel cartridge (C-8417) and an original Hayward (CX1750RE)?

FYI I saw the same behaviour with the old pump too so I don't think it is related to that. The pool company said I need a new pump and it was getting pretty old so thought I would try replacing it as a possible cause. The only thing left now is the cartridge.

Thanks for reading.

[Denniswiseman]

You say the pool was green, it could be the filter is doing it's job
Let's have your numbers (CYA is very important) Use a pool store if you don't have a FAS/DPD kit
FC:
TC:
pH:
TA:
CH:
CYA: