[Gurdy]

hi one and all, just a quick question, i've got 38psi water pressure going into my van mount r/o system, can only get water down to 41ppm into tank(Hants hard water ).  Here goes,is more/less pressure going into system better???

[stevekennedy]

The more the better. If using 4040XLP I think they can take up to 300psi. Don't quote me.

We run ours at 125psi. Gets the water down from 078 to 001. We resin filter the last bit out.

[EasyClean]

I was running a 4040 RO straight from mains with high pressure and my TDS had slowly risen to 42 after 4 years of constant use. I wasn't flushing out much waste water either because I was always filling my van tank as quickly as possible because I had fitted a flow restrictor to the waste flow.  Then after reading this forum I fitted a booster pump and regularly flush my RO and my TDS is back down to 003. It's like having a new RO again. Don't have to buy so much DI resin anymore.

[stevekennedy]

Good advice from easyclean. Always flush your RO regularly.

[Gurdy]

cheers tried a mates outside tap, with 56psi, did the trick got it down to 28ppm on the right track now