jm,

Thanks for your informative post. I do recognize that a small Brita filter system may not be the highest specification option, and I hadn't even considered Brita domestic filters until Trevor's mention. I already own one of the particle filters (the Ametek AM1), so I'm looking at the further options when deionized or distilled water is suggested or needed.

Trevor,

On the Brita filter: What processes are you using the Brita filter water for, and how many litres do you get before the cartridge needs to be changed?

On the lab deionizer: Approximately how many litres of water can be processed per 40 cartridge?

Tom.