[matty72]

My tds on 4040 after year is at 41, live down south so hard water but after a year sucks, have to say i havent flushed it out regularly  just when i think of it, what do you let your 4040 go up to before you have to change it

[NWH]

Doesn’t matter how hard it is it shouldn’t read that after RO I’d say it was buggered.

[matty72]

after one year do you reckon it could be not cleaning out enough, I suppose it could be many things any advice on a fix, i have tried the waste  pumping through for a while and by passed the filter which is to old, any ideas what else i could try

[NWH]

When you first get them they have solution in them which raises the tds initially which passes with flushing and use but for it to jump to 40 all of a sudden is unusual,do you have 2 pre filters.

[matty72]

i have a single pre filter that does 2 in 1 job if you know what i mean, i by passed it though same reading 41

[High-Tower]

Bypassing your prefilter will ruin it. The chlorine breaks down the membrane.
You need to change your prefilter regularly to keep your ro membrane working efficiently.
I have 270ppm tap TDS and use a 3/4 year old RO still producing 11ppm.

[SB Cleaning]

The RO is shot now...I change mine at 25 anything higher its un economical with resin...

I only flush my RO once a year, I bought a new 40 40 Ro this time last year and its reading 9tds now from 5tds new.

[dazmond]

My tds on 4040 after year is at 41, live down south so hard water but after a year sucks, have to say i havent flushed it out regularly  just when i think of it, what do you let your 4040 go up to before you have to change it

mines 024.....









straight out of my tap....

[SB Cleaning]

My tds on 4040 after year is at 41, live down south so hard water but after a year sucks, have to say i havent flushed it out regularly  just when i think of it, what do you let your 4040 go up to before you have to change it

mines 024.....









straight out of my tap....

Crack on with tap water then 

[matty72]

cheers, it's all a bit weird really but i will order another one, and change the pre filter alot more

[Simon Trapani]

It amazes me how many window cleaners don't really know how their system works or how to maintain it.