As the water going through the DI is going to be almost pure (though I think that depends on how ward the water is in the first place
) You should be able to go about 3 months or so.
It really depends on the TDS reading prior to going through the DI.
It also of course depends on the size of the DI tank.
There is a formula for working out exactly how much water a given amount of resin will produce, depending on the hardness of the water
Much easier just to check your water quality after it has passed through the resin.
Once it starts to get up to 0.010 and above its time to change your resin.
60 psi isn't high, but it isn't that low either.
The most water that I use is no more than 250L in a very full day, max.
But if you are spending all day working domestic houses, and, for the sake of average lets say they are all 3 bed semi's you should be able to do one with about 18/20 litres of water.
350L should allow you to do about 20 houses.
But you need to tailor your system to your needs (not forgetting future needs
) 250L is more than enough for me.
I would reckon that one litre of water will earn me a minumum of 50p up a possible maximum of £1.30.
The money spent on a your RO will soon be recouped.
Don't forget, if you are leaving your water on over the weekend, you will be starting your week with a full cubic metre of water, as each night passes, providing you don't forget to turn on your system
You are going to top it back up overnight.
Once you have filled up, you are unlikely to run out through the week, unless of course 2 of you are running 2 poles and working flat out on some very big jobs with the water pumping as fast as it will go
I don't know if your tank is baffled, but if it isn't you are going to have problems
Ask Roy Harding what it is like to drive around with an unbaffled 1000L tank
He didn't do it for long!
Ian
