Hi Guys
Iv got a 300ltr Tank that i need to fill every night with pure water.
I have a 300 GPD RO System, it takes over 15 hours to fill my take and my water bill comes to £300 a month, i took someones advice and swapped over to DI Vessel and Resin this method is a lot quicker it takes just over 1 hour to fill, im using 2 vessels but this is only lasting one week at tops as my water out the tap is 325. one day its on 001-002 then 0.90 before i know it.
has anyone got advice on how i can fill my take fast,efficient and reasonable cheaply? any advice would be very much appreciated.
Thanks Ryan
Hi Ryan.
IMHO a tds of 325 is too high to process through a di vessel except in an emergency.
Unfortunately processing water through a small r/o is slow and usually the best way of doing it is the process water into a holding tank. Most of us use a 1000 litre IBC tank bought second hand for around £50.00 + tansport if you can't collect it yourself. A cheap submersible pump will make transfer to your van tank quite quick. (Consider that an r/o spec is given in US gallons which are smaller than Imperial gallons. The day is also a 24 hour day.)
We found that our 450GPD r/o took about 28 hours in the winter to fill an IBC tank at 50 psi water pressure. In the summer it was about 20 hours. (Waste to pure ratio was 3 to 1).
Most Roman type r/o's are set up with a 3 to 1 waste to pure ratio. This means that to get 1 liter of pure cost 3 liters of waste. So you would use 4 liters of water altogether. So the first thing I would do is check what that ratio is. If you get 2 plastic containers the same size, put the waste into 1 and the pure into the other and run the r/o. Just by looking at the 2 drums after a while will tell you if the ratio is correct. Most r/os had a restrictor in the waste pipe but some had a tap. If there was no restrictor or the tap was open too much, you would be wasting water which will be costly on a meter.
Modern 4021 and 4040 r/o's will produce water much faster. My 4040 with 40 psi and an HF5 membrane will process pure water at around 2 liters per minute. They aren't cheap, but they will pay for themselves pretty quickly when you consider what resin is costing you. Consider them an investment that you will have for years.