Phew, I was surprised by your previous post that said a 2550 watt unit only needed a standard powerpoint (and thought I had forgotten the last of my electrical engineering training from a previous life) :o
2550w / 240v = 10.6amp
With most 10amp "safety switches" set to a litigation safe level of 9.xamp I would expect them to throw each time you turned the machine on.... unless you opted for the 3" nail ;D
As far a water purifiers go Im even less of an expert but I do know that all the 1 micron ones that I looked at previously had REALLY low flow rates and that is when they are brand new. Depending on how clean (or not clean) your water is as to how long it will take for the flow rate to halve. You might find that using a 5 micron system will be a better compromise between flow and filter life.
Most of the canister systems have different cartridge options that will get you to the results needed, you just need to know how much water the new toy needs (litres/hour)