[colley614]

Wow looks like I will be dealing with pure freedom if thats the case

[need a cleaner]

Andrew is very helpfull, i call him yesterday to order some refills for my DI and they arrived this morning

[KarlJones]

I use a 300GPD as it suits my own needs, I can not have a huge IBC as I am in a flat.  So I use a slimline 100 ltr water butt, the advantage the faster water gives me is that it fills quickly (obviously) and therefore removes some of the disadvantage of my water storage being small.  I can easily keep up with it and it keeps up with me. It also means I can switch the RO off, which I am more comfortable with being in a flat as I don't have top leave it running unattended as much (which I would if it was slower)

If I had space for a 250 liter container outside then I would not worry so much about this. and 100 GPD would be more than ample.

Now here is something interesting,  I would prefer the 100 GPD running into a 250 Ltr Butt.  The reason is the way 300 GPD systems seem to work is they are 100 GPD X 3.  They feed the waste from one membrane into the next.  So the TDS from a 100GPD system should be lower than a 300GPD system.  Someone will correct me if this is incorrect, and maybe I will have to test the TDS of the different membranes to get a true result though.

But in saying that, a 300 GPD does get you sorted out quicker if your in need of faster water.

Make sure you get a decent DI filter.  I tried a 250ml job and it was just not for me, they seem to be more prone to leaks.  a big blue fire extinguisher type also wasn't for me as I couldn't figure out how to plumb it in (hozelock to thin pipe isn't my strong point)  Get a 700ml one for easy fitting or higher if you do not mind the headaches of plumbing them in.

[brightnclean]

Any difference in TDS out would be negligable between a 100 and 300 "in sequence" RO.  There is one BIG difference though. WASTE WATER.  On the 300 I have (Purefreedom one) I get around 1 to 1 product to waste but with a 100 it can be up to 5 parts waste to one part product. I get 97 to 98% TDS reduction from my 300 GPD ro and hardly use any resin nowadays. The best I ever got from my 4040 RO was 92%. OK I could have improved it with a booster pump and errrr  regenerating my softener when I should have  but its such a mess about to do this. The 300 is so easy to set up and maintain in comparison.  Anyone want to buy a Kn*ckered 40 inch membrane? 

[KarlJones]

yes I just did a test.

100 GPD gave me a lot of waste, and I mean loads and loads of the stuff and only a trickle of pure.  The pure was 009 TDS.
300 GPD gives me about 14 TDS, so the difference is not great as far as TDS goes.

But the waste with 100 GPD was horrific, normally I produce slightly more pure than waste (using a purefreedom 300 GPD)

[matt]

what you need to do is fit a little tap on the waste pipe, turn it to about 1/4 shut, this slows the waste and speeds up the pure flow

i get about equal now using this method

i flush the membane every week and you MUST open the flow 100 % for flushing