[noizeo]

hi guys silly question but how do I flush my 4040 ro as new to this system?
reading of 204 from ro unit?

[SeanK]

hi guys silly question but how do I flush my 4040 ro as new to this system?
reading of 204 from ro unit?

You will have a tap or lever on the RO just open it out full to let all the water run to waste you should have no water
going into the tank other than maybe a trickle.
204 doesn't look good and I don't think flushing will get that down much, you either don't have enough tap pressure or the
membrane is knackered.
I just hope that you haven't been running it with the waste fully closed as they need to be set at around the 50/50 mark.

[noizeo]

thanks seank, only brought system last month, he said he brought a new membrane last year? pressure at my house is very good but I haven't been filling @50/50! been filling up at 70/30 ?
but tonight I have taken the membrane out and it don't look to good, very dirty.
how often do you flush?
many thanks

[SeanK]

I would usually flush for about 5 to 10mins before starting to make pure and then close the tap off slowly until its around
the 50/50 mark, that's not the ultimate rule basically you need to adjust it until you get the tds to the lowest level.
 wouldn't risk going beyond 60/40 in favour of pure though as it does say on my membrane cover that 50/50 is recommended
and not to fully close the waste valve.
Then once a month or so I would flush for about half an hour.
An 4040 RO set up right should remove 98% of the dissolved solids depending on good pressure and so on and will start to
creep up slowly with age.
Give the membrane a good flush for a couple of hours or so just to see if it helps you never know,  some of that dirt could be algae and only on the surface.

[Smudger]

Have you been using pre filters ?

Darran

[Perfect Windows]

thanks seank, only brought system last month, he said he brought a new membrane last year? pressure at my house is very good but I haven't been filling @50/50! been filling up at 70/30 ?
but tonight I have taken the membrane out and it don't look to good, very dirty.
how often do you flush?
many thanks

If it looks green and is even a little slimy then it's infested with bacteria.  If it's that then you'll need to dump the membrane and replace but before replacing you'll need to sterilise the whole system or you'll lose your next membrane within two or three months.  I know because I went through the whole sorry saga of three membranes in about six or nine months.  Very expensive.

I did a post about how to sterilise.  I'm off for a meal but I'll look it up when I get back and post it.

Vin

[Perfect Windows]

Here it is.  Any slime on the RO membrane or in the housing and you need to go through this process:

http://www.cleanitup.co.uk/smf/index.php?topic=175665.msg1483617#msg1483617

Vin

[noizeo]

Thanks a lot vin. Yes was slimy . I will sterilise the systeM. many thanks
Hi Darren,yes we have two pre filters.

[Perfect Windows]

Thanks a lot vin. Yes was slimy . I will sterilise the systeM. many thanks
Hi Darren,yes we have two pre filters.

Not sure I was perfectly clear in the instructions, so basically you're looking to throw away everything that's inside your system, so every filter and the RO membrane.  They all go in the bin.

Then the rest of the instructions are based around sterilising the empty system from the tap input to the point where the water leaves the last hose to go into your tank.  You want all of that to be full of bleached water for 24 hours.  Crucially, you need to flush after those 24 hours until there is absolutely no smell at all of bleach, as that knackers membranes.

The good news is that I went through this process three years ago (might be four) and I've never had another problem.

Good luck.

Vin

[Lee GLS]

There is no need to flush your ro. It's constantly having water washing over it when in use.

My 4040 is 6 years old in May, produces about 1800L a week tds in is 375-400 and produces at 20ppm.  I used to flush when I first had the system, but I was told by gaps water it wasn't necessary so it stopped, so I haven't flush it for 3 years now.