Pentair Chlorinator

[Colatech]

Hi all and thanks in advance
Jut moved into a new house with an I ground pool. Had had a hard time keeping chlorine levels up, having to add liquid quite a bit. The chlorinator hardly uses any tablets maybe 2 a week. After noticing and investigating, it seems the previous owner has installed the offline chlorinator, a Pentair 300, with both lines plumbed into the same piping going to the pool actually within 2 ft of each other. If my reading of instructions is correct, this is wrong.
Thoughts?

[Denniswiseman]

You are better off not using stabilised tabs because they are continously adding CYA
Excessive CYA renders your chlorine ineffective and you have to use more to get the same sanitation
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm
To reduce your CYA you have to do a partial drain and refill
Keep using Liquid chlorine (sodium hypochlorite or plain bleach) and maybe the tabs when you are on vacation