[Smudger]

I would say they all give the best rejection rate under the optimum conditions - pressure/water temp/etc...

Darran

[dd]

 If you use a water softener it should significantly increase life of membrane (in hard water ares).

[Smudger]

That's true - but they seem complicated having to regenerate etc....

Darran

[dd]

I just have one plumbed in to my system (the type you would fit to your house). It automatically regenerates. I just tip in a new bag of salt tablets every 2 or 3 months. You would get through more salt, I am a sole trader.

[Mike Burd]

That's true - but they seem complicated having to regenerate etc....

Darran

I believe they regenerate automatically if it’s high end. I was looking at a GAPS auto RO system that was around £4K but then I think well I’m managing ok now so why spend it? Requires a water softener though.  If I’m honest my setup is just cheap and dirty and slightly embarrassing in the context of the scale now. Works though.

https://www.gapswater.co.uk/acatalog/Aqualine-Alfa-240-RO--250l-hr.html

[Perfect Windows]

I got another 6 months out of the membrane before it started creeping up again.
Decided to replace at that point rather then trying to clean again.
I replaced with this one
https://www.ebay.co.uk/itm/4040-RO-Membrane-for-4-x-40-Reverse-Osmosis-Membrane-Housings-/263437782685
Alot cheaper then axeon and its been brilliant so far, gets water down to same ppm as axeon and same production as well.

Thank you!

The old membrane seemed OK when I opened up the housing but green gunk flowed out when I descaled it so I guess it was bio contamination. Normally they are slimy on the outside of the membrane but this one wasn't.

Bleached out the whole system, left the bleach in for three days, and meanwhile took a punt and ordered one of the membranes you linked.

Been running for an hour now and it's 307 in, 1 out. (!)

Happy camper here. Obviously depends how long it lasts but pretty content at the moment.

Thanks again.

Vin

[Perfect Windows]

Thought I'd follow up.

Still going strong. The TDS 001 lasted a couple of days (until the carbon particles settle down in my input filter) then it goes up a bit. Output now is either 3 or 4 ppm.

Very happy with this cheap membrane.

Vin

[Mike Burd]

I think there’s more to membrane life and efficiency than I’ll ever understand. I have a Hydronautics one at the moment that’s been in 6 months and producing at 1ppm. I’ve changed the predictors once and we produce 2,500-3,000 litres a day. Input is 300ppm. I’ve never had a membrane last more than 8 months before and with lower output. Nothing has changed. Same tap, same pump.