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I've just bought a membrane from these https://www.ebay.co.uk/str/industrialwaterequipment my present one is reading 015 and coming out of the DI it's 005. I'll exhaust them both before putting the new membrane in. To be honest I didn't get much life out of the present membrane, possibly about a year but I don't change the pre filters often enough. I know I should but I'm lazy