[L.J.Thorpe]

no honest i have checked it regular over last 2 years takes just over twice as long to fill a 25 ltr container from waste as it does from product

[matt]

If you can make water quick enough you don`t need to have it going 24-7,if your only getting such a small amount of water per hour from a 200gpd unit how much do you think your chucking down the drain.The water pressure out of the tap won`t alter no matter what Ro your using,the smaller RO unit will waste so much water it`s a joke.

fit a little tap to the waste water pipe, it slows it right down

i get allmost 2 pure to 1 waste

it works well for me as the waste is just a trickle

[L.J.Thorpe]

any way i thought that 40 40s produced more waste than ro-man type systems isnt that why they can make larger amounts of pure in a shorter time?

[[GQC] Tim]

any way i thought that 40 40s produced more waste than ro-man type systems isnt that why they can make larger amounts of pure in a shorter time?

You are chucking about 60 to 75% down the drain on a 4040. Sure you can tune it down to 50/50, but the membranes don't last as long, and up to and over £200 a pop for some of them, they are a bit too expensive for that.

That roughly translates to :

400l produced, is 600l waste.
250l produced, is 750l waste.

200GPD might be too slow, but a 300GPD shouldn't do too bad if you leave it on 24/7. All depends on how much water you use. If you use around 500l per day, it should be okay if your static.

I've got everything in the van, so I need quick fill times. 4040 for me.

[RK Cleaning Services]

600l per week will be enough at the mo as only do three days per week

[drwindows]

200 litres a day? not enough surely?

[Justen Uff]

Ok If you work at night.

[collins82002]

I got a 300gpd and with my booster i can produce a Ltr in about a minute,  running it every other day so i get fresh clean water into my ibc tank then transfer it to my 250Ltr tank in the van.

[leapstallbuildings]

I've got an unpumped merlin and it was only giving 25 litres an hour when I last checked. Water pressure is low though.  Usually below the desired minimum of 40 PSI.  I think the main issue is:  Does it produce enough for your window cleaning needs?  If so then no problem IMO.  I would also say hat there's no harm if it does run continuously either because it avoids that high TDS water from the RO when first re-starting it.
My waste is restricted.

[Smudger]

Using a Merlin with pump -  fill 250 ltr tank in 2 hrs


Darran