Any ideas lads!

[macca]

Have just installed a 300gpd RO with DI and has a booster pump but i can't seem to get the TDS below 11, everything seems in order , have flushed it thoroughly but it doesn't seem to wanna go down any lower. Any suggestions would be appreciated. Thanks.

 

[Smurf]

How long did you flush it for?

What is your tap tds?

Maybe let in run on flush with the di disconnected down the drain for a further 2 hours then see if it drops down then. Don’t forget about tds creep when you start the ro as if you take a reading straight away it will be high and should gradually drop down.

.

 

[macca]

Hi, tap tds is 281 and have put it back on flush now and is still on after 20 mins will leave it for a while.

 

[Smurf]

When I bought my 300gpd Purefreedom recommend to flush a new ro with the new pre filters fitted for at least an hour or two to get rid of any chems left on them due to the manufacturing process.

 

[macca]

Cheers will keep it going for a while.

 

[Diwrnach]

Yeah from my experience of setting my RO up badly first time is, as Smurf says flush the hell out of it for a few hours with no resin in it, what I did in the end was flush it for maybe 3 hours, then I ran it over night still with no resin, and kept it running until the TDS was stable and wasn't coming down anymore, and THEN added the resin.

 

[Smurf]

I have about the same tap tds as yours and eventualy the new 300gpd ro went down to 002ppm

 

[Diwrnach]

I only have a 100GPD unit, but my tap is around 460, it comes out at 006 now.

 

[macca]

Cheers all flushing like mad...

 

[abs]

I'd run the ro after without and resin in and see what numbers it's producing , should be below 15 really,then add the di cartridge with new resin , if that don't take it to 0 then the di cartridge isn't sat correct