[david wood]

hi my tap waters 200-250 tds i need to make about 650ltrs of water a day and ide like my tds after the ro to be as low as possible would a 450 or a 600 gpd do the job or a merlin but ive heard the merlin will still leave me with a tds of about 30

[Total shine cleaning services]

My tds out of tap is 470 my 450 gpd puts it into my tank at 13-15 if I plug in booster pump it comes down to 6, make sure enough pressure out of your tap or u will need a booster pump, you really need it to be at least 50psi-hope this helps

Graham

[david wood]

thanks graham how many ltrs a day can you make with no pump ?

[Spruce]

Hi
I have a 450GPD RoMan unit (300GPD but now with 3 x 150GPD membranes) and with planning you may get away with 650 litres per day. We do struggle in the winter as production rate goes down with water temperature.
We process into a 1000 litre IBC tank and currently on 50psi water pressure at the tap and no booster pump and it takes about 26 hours to process 650 litres.

We get by by filling the vans during the weekend and try to start the week with full vans and a full IBC tank. It's not ideal and this is the next upgrade we need to do.

So, my advise would be to invest in something bigger, like a 40/40 R/O. Merlins haven't got a good name for efficiency. They were designed for the American under counter kitchen accessory market where as close to zero tds isn't necessary.

Gardiners have a 950GPD unit which could also be worth looking at although they are out of stock at the moment. I'm a total Gardiner fan, but if you go for a 20" R/O with 2 membranes then the cost of replacing both of those in 2 years or so will be much more that replacing a single 40/40 membrane.

Spruce.

[Total shine cleaning services]

I think I have the 600gpd with booster but don't always use the pump, you should get your 650 litres a day,I use about 500 litres a day, I usually fill up the van with transfer pump in the morning, then I turn ro on as I leave and it's usually replenished my ibc tank by the time I get back,will u be doing the same ie static set up..?

Graham

[Total shine cleaning services]

Mine is a streamline 600 gpd it does a good job, if u get an ibc tank this would do,the days when I pop back for a fill up I just leave it turned on,if you started say 9 every morning that's 24 hours it has been on which is more then enough

Graham

[Spruce]

We have a float level switch in the tank connected to a 240v normally off solenoid valve. Once the IBC tank is full the current to the solenoid valve is cut and the water supply to the r/o is switched off. This means we don't have to worry about watching it any longer.
The unit automatically switches on when about 300 litres of water is drawn from the tank and switches off when full.

We set it up like that so the r/o won't be cutting in every time a small amount of water is drawn from the tank.

The other solution for us is to get a second IBC tank and link to 2 together but space is an issue.

Spruce  

[Rob_Mac]

David

I do very little window cleaning now but have a couple of units. From Cleaning Spot I bought the twin RO 600GPD pumped unit, in a white frame.

Nice & compact, basically plug and go. It has just filled three IBCs up, in my unit, in 24 hours.

Pressure gauge fitted reads 100PSI

TDS in 270

TDS to holding tanks 001

The only downside is it is not a continual run pump and it must be connected to a timer that allows it to be off for half an hour after every hour of running.

Not sure how much but I know it is a current model and I think I paid about £450.00

Rob

[david wood]

great.yes i will have a static in the garden maybe 2 ibcs not sure weather ial have electric for the pump depends where i put it all in the garden does the water cut out switch run of elictric? maybe i mite have to go for a 4040 or Gardiners set up then as i dont want any probs with not haveing enouth water in the morning as most days i leave the house at 5.30-6 in the morning so i want to fill up the night before if possible

[david wood]

hi rob yes i was looking at them i think stream line do the same one ,do you still think it would run ok with out the booster pump

[Rob_Mac]

I guess so if you have good water pressure.

There was one on the for sale section 300GPD un pumped a couple of weeks ago.

Rob