Got it, not allowed to post links but its over on Matts forum under "Resin Saver by Rich P&F" Notice the old date ! If you want to see the pics you will have to visit. Probably in the wrong topic over here.
Quote (sorry opics wont transfer)
Posted: Fri Jul 07, 2006 8:45 pm Post subject: resin saver -- from Rich P @ F
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Matt posted this.
This will only apply to you if your DI only im sorry to say , the following easy to build filter has cut my resin use from 12 bags per year to 4 bags per year .
Your cost cut may be different depending on your TDS from tap reading , mine is 100 TDS .
All that is needed to build the filter is .... 1 - 10 litre plastic bin.
2 - Elbow joints.
1 - Zip tie.
1 - Scouring pad.
The filter is made by cutting one of the elbow joints into the side of the bin 2 inches from the bottom , this is your water inlet , the scouring pad is then cut to size and zip tied over the elbiw joint inside the bin , this just stops the resin flowing into your feed hose .
The other elbow is then cut into the opposite side of the bin 2 inches from the top , this being your outlet .
Then put a quarter of a bag of new resin into the bin and your ready to go .
Connect your tap hose to the bottom elbow and fill the bin from the top with pure water , then turn your tap on to a very slow flow rate until the water starts to come out of the hose on your outlet .
You will need to keep an eye on it for a while to make sure you have the right flow rate , all you need is a constant trickle , about the same diameter as you would get from 1-2 jets of your brush head , this may not sound a lot , but remember this thing is on all the time day and night .
Once you have built up your stock of water it is very easy to keep you stock level up , i never run out of water as i have the IBC.
How does it work , i think it is due to the fact the the water flow through the resin is reduced that much that it does not have to work so hard .
The other upside to it is you will not have to change the resin in your van mount for ages as it is being fed with pure water .
I used to have to change my van DI every week and it did my head in , i cannot remember the last time i did it since using the filter .
Also you can leave the filter going until your output reaches your original tap TDS level , your not losing anything are you.
When you see the TDS rising i have found that giving the resin a good stir brings it back down again , the heavier used resin sinks first and the better resin sits on top .
The following pictures are the filter , then the whole setup .
If you got the time , give it a go , im saving 8 x £70 a year . £560
Rich P @ F