[m.b.s.]

i have just installed a ro man upggrade kit i had a 100 gpd system that the readings were like this input water 235 goes through ro with 1 membrain out of membrain 002 through 500ml di 000 good
right just installed new upgrade kit water after pre filters 200ish through 1st membrain then using wast to go through second membrain out through second membrain 006 through 500ml di and as i got a 250 ml membrain with it i attached this one as well so runs through 500ml di then 250 mldi reading 000
the reading has gon up from ro to di but this is becuse i am usind the wast isnt it is this good or bad and how long will my resin last and my membrain which the wast is going through
glad i did it because produced water was slow noe its well fast any advise

[Andrew McCann]

The reading out of the RO will probably drop over a day or two.

You will get a very slightly higher reading out of the RO with the extra membrane on it though. Minimal really.

Andrew

[m.b.s.]

The reading out of the RO will probably drop over a day or two.

You will get a very slightly higher reading out of the RO with the extra membrane on it though. Minimal really.

Andrew

so every thing is a ok just got it on back flush at the moment to see if this will make it drop hoew long will the second membrain last with the wast going through it any ideas

[Andrew McCann]

YUP everything looks OK from what you have said.

Don't bother backflushing. It won't make any difference to TDS out.
I hope you ran the RO disconnected from the DI for around 30 mins or so because the new membrane will give you a high reading out until the chemicals have gone from it. Any time you put a new membrane in or run an RO for the 1st time you need to get rid of the first few gallons of product water down the drain.

How long will the 2nd one last?  Prob 2 to 3 years if you change prefilters regularly as per instructions for your RO and give the system a regular flush.

Everyone talks about backflushing RO's. With the RO-MAN type and most 40 inch systems all you do by opening the flush valve is let the water flow freely through the system with no restrictions. This gives it a good clean out but doesn't backwash the membranes because there is hardly any pressure to force the water through them. It's basically a surface wash which is all you need to keep the sys in good nic.

Andrew

[m.b.s.]

thanks for your advise and time andrew cheers