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I believe you, he had put in new tabs in addition to the 3lb dichlor - which I assume is what kicked his reported cya up from 100 to ~200. I am using Liquid chlorine now.

No algae. The filter is 72 sq ft and 9 lb DE is specified on the casing (and on line). Pressure is still 17 - point taken about back-washing. Since changing 75% water two weeks ago I have been trying to get on top of the chemistry (using the TFP recommended pro kit) using liquid chlorine...

Wow - I couldn't even get the assembly out, never mind strip it down. I was also concerned about what brute force would do to the connecting pipe. I will research cartridge filters. Cheers

Apparently the heater was disconnected some time ago and left so that water just flows in and out of the casing. Which presumably means the bits of plastic will be recycled through the system?

Thanks James, what is the significance of the crushed ribs? I will see if I can find that thread.

Yep ... I was not able to lift the whole assembly out by myself. But hosed down as best I could.

Thanks ajw, When you say 'well it did' do you mean it is possible that a clean filter got that bad in a few weeks even though we have had no algae? Not so much dust here, surrounded by trees and scrub. I put in 9lb DE and the psi has remained steady at 17. Don't know what an MPV or slider...

Thanks Jim, The water has been clear since we arrived, and fine for swimming. After the Maintenance guys put in 3lb dichlor the cya got to ~200. I changed 75% and it is now around 40. It was all new to me - the pump had been consistently around 40 since we moved here. I am now maintining the...

I am new to pools, owned one since Feb. Pump pressure was consistently around 40psi. So I decided to clean the filter. Attached is what it looked like when I opened it up. My pool company claim to have washed the filter in March. My question: is could it have got that bad in six weeks? Cheers

Thanks, I have only just seen your reply. The TF-Pro kit arrived today and I have tested CYA twice (in line with your recomendation because the first test only got half way to the 100 mark). The second test =100, thus a cya of 200. I also used the Comparator Block test and got readings of 0.5...

Hi y'all, Bought a house with a pool (12k, in-ground, plaster) in Feb this year. The pool has recently taken on a green hue! After 1 month gap the pool guy turned up today and measured 0 chlorine, 7.6 pH, 120 TA, 500 CH and 100 CYA. He added 3lbs dichlor shock (plus phosphate I think), and put...