View Full Version : Water Deionization at home/workshop

27-10-2017, 02:53 AM
Hi all!

I have been using quite a bit of de-ionized water lately and looking to reduce my costs.

Currently I am getting 5L for 2.29 at my EuroCarParts.
That is around 46p per liter.

With the anodizing setup in my workshop now I am using a lot more than normal. I keep clearing out my local branch too so looking to buy a de-ionizing kit to reduce cost, time spent getting the stuff and ease of having it on tap..

From my research, to de-ionize all you really need is a resin filter.
There are full reverse osmosis systems out there but is that all really needed if you just want de-ionized?

I have been looking around and have found a filter that is pretty much self contained. It is 30 and does around 2000L. So works out to around 1.5p per liter excluding metered water. https://www.eastmidlandswater.com/Details.asp?ProductID=758
Which is around 1 per 1000L so add .1p to that.

1.6p per liter is a lot better than 46p plus the fuel driving back and forth.

Am I on the right track here?


27-10-2017, 07:47 AM
Having used a small deioniser filter as part of a wire edm machine recently, which needs a continuous supply of pure water, the resin exchange mechanism certainly seems to work. I can't comment on running costs as our use is very different but it seems that you can reduce running costs by starting with something like rainwater to reduce the "load" on the resin, and a cheap TDS meter is very useful to monitor water quality coming out, so that you know when the resin is getting exhausted. Our filter uses a refillable filter cartridge which helps reduce cost but it rather depends on the quantities you are taking about.

27-10-2017, 10:07 AM
There's gallons of distilled water comes out of my shed dehumidifier, that would be a cheap start if you know someone who runs such a device.

28-10-2017, 04:46 PM
My Gran used to have a water softener (In the '50s) 23113 and it was regenerated using salt. I wonder if there is any way of reviving spent deionising cartridges in a similar manner. They are both based on ion-exchange resins.