[MNWC]

How often and how long should i flush the 4040 for ?

[martinw]

15 min after 1000litres of pure in one go or 5min before and after (thats what i have been told by vyair and gaps water)

[MNWC]

ok thanks, got mine from vyair

[Walter Mitty]

15 min after 1000litres of pure in one go or 5min before and after (thats what i have been told by vyair and gaps water)

I think I need to flush more then.  I do it about once per week while filling the van.  Probably averages about 10-15 minutes per 2500 litres.  After 4 years, it's still turning out water at 008 though (006 was the best ever due to the low pressure).

[ben M]

20 min once  a week is enough.

[Michael Peterson]

I go for 20 mins once a week and use about 1800 l a week, I cant really know if that's right for sure yet though as ive only had the thing a couple of months

[Lee GLS]

I read on here a little while ago that gaps water said there is no need to flush the membrane.

I stopped flushing mine over a year ago, and it has had no effect on the membrane. It is nearly 5 years old, water in is roughly 350ppm and the RO output it 18ppm. It produces 2000L a week with  60% waste.

[britishwill]

No need to flush. June at Gaps water said that to me. I have not flushed for over a year and everything is fine with mine

[chris turner]

I always find flushing has a negative effect on performance on my 4021 membrane so I have also stopped flushing.
It just seemed to slow down production where as now I don't flush production rates stay the same.

[MNWC]

Mmm a mix of opinion there then. So how come manufactures recommend flushing a 10 inch membrane...

[britishwill]

Sorry I was told not to flush the 4040 membrane

[Steve foster]

I flush mine when I change the filters, every 3/4 months. It only removes the particles from the outer skin. My last RO lasted about 12 years.

[Michael Peterson]

Excellent I hate flushing sa , I'm not gunna bother any more June at gaps would know she nahs it all

[Mick Kent]

I dont flush either and mine gets from 380ppm to 006ppm. Membrane is 12 months old.

[Perfect Windows]

June at Gaps advised me that if you don't flush, the effect will be to reduce the speed at which you produce pure; it won't affect output TDS.

I flush about every two months for about ten minutes.  Membrane (HF4 4040)  is now two years old and producing at exactly the same numbers as a week after I bought it.

Vin

[Smudger]

I flush before and after each use, but I produce at least 2k per time I run, I haven't noticed any longevity in low tds doing this, but like vin it is producing water at the same speed as when new.

Pre filter changes are more important IMO

Darran

[frankwii]

sorry for my ignorance ,

how do you flush the membrane  .

Mine has shot up from 15ppm  to 35ppm over a year so would know if the flushing might help .

[martin hulstone]

Hi frankwii,
Its martin from sandbanks road, if you need any advise text me on 07588620759, have you got a clarke water pump?
if not you need one as your tds will slowly creep up to the 50,s. I went through a 40/40 once a year till i bought one. Had mine over a year now and tds is still  around 10 from 400 tap water. i presume your water pressure in poole is crap too?

[MNWC]

I dont flush either and mine gets from 380ppm to 006ppm. Membrane is 12 months old.

You using a booster pump with that ?

[frankwii]

Hi frankwii,
Its martin from sandbanks road, if you need any advise text me on 07588620759, have you got a clarke water pump?
if not you need one as your tds will slowly creep up to the 50,s. I went through a 40/40 once a year till i bought one. Had mine over a year now and tds is still  around 10 from 400 tap water. i presume your water pressure in poole is crap too?

Hi Martin.  Thanks for that info.  I've put a water pump  in during the weekend and it brought the tds down to 30 after being aprox 15 to 20. The ro membrane is only a year old and it shot upto 50 within a couple of weeks.  Unfortunately hard water and pressure fluctuating   in the area not helping much. If I can squeeze another year out of it would be great.  Thanks for the suggestion though