[g4reth]

I am a newbie to all this so I need all help I can get.  I am getting a TDS reading of 150 and I am using a 25 litre di tank.  Is that reading good enough to do the job with just the resin, or will I need an RO?  Plus how many litres of resin do I need to put in that size tank and how long do you think it will last.  Soz for being a pain.  Thanks everyone. 

[Nathanael Jones]

A tds of 150 will use the resin fairly fast,.. an RO would pay for itself in 4 or 5 months.

A 25 litre vessel will prob take 22 litres of resin,.. I've never managed to get a full bag into mine anyway!

[kaz and pete]

hi we have been a di resin tank for a few months now and our reading is 250 and out of a 25 lt tank witch will only hold 22 lts we get about 2500 of pure water so you should get lots more we live in a hard water area but we find that there is no waste water like there is with an ro system although it is cheaper to run

[chuggers]

Gareth you can always just run through resin for a few months and calculate the cost of replacing the resin and see how it is working out for you. You can compare this to the cost of a RO unit, which would require filter changes every few months. In the long run, RO will always be cheaper but at a tds of 150 it may be some time before it starts paying for itself.