So next is that people on edmw migration threads, one area not looked into is water filtration system. Well, likewise motohome, china home, china hdb, taiwan home, US home, everywhere is talking about water filtration.
Now water collection is different from water filtration, filtration comes before and after rainwater collection so they are two different parts when you look at it this way. This part focus on using it for your kitchen, so not touching on flushing things like that.
And yes, some Singapore homes do have 3 stage water filtration system installed, one of my neighbour is one of them. Not be touching on RO because they actually create a large water bill, personally I tried it already.