[cbkhoon]

i will try to share as much as i know, i have involved in selling water filter last time, I am glad that the knowledge is useful for CP too..

RO could be useful for most CP, because it is really "clean" in terms of free from high dissolved solids, minerals, organics & sediments. The only thing to watch out is that the dissolved oxygen level is lower & the pH of RO water is around 6.X, it is considered mild acidic.

I have a RO machine & diamond energy water filter at home, I normally use the RO for my marine aquarium but I drink only water from the other filter. Now I am using the RO for my CP as well, but i mixed in 25% of Diamond Energy water to get the pH back to around 7.2-7.4. Our tap water/city water usually gives pH around 7.8-8.5, which is considered hard water.
I have seen better growth by watering my other flowering plants with Diamond Energy Water, I believe that it may somehow benefit CPs as well but it may still contain too much mineral. Therefore i am mixing 75% RO to 25% Diamond energy water daily b4 i spray the water on the CPs.....As for Sarracenia, so far i only tried RO, I will try to mix the water to observe the effect on that. Will do that once i have more plants.

Generally I would say that, any-brand filtered water is a must, better than u dun have one, but it may not neccesary RO, all sediments & harmful dissolved things MUST be removed b4 watering the CPs. A simple DIY setup of 2-stage filters consist of a ceramic candle & a carbon filter will cost about RM100-150. These include 2 units of common filter housing. Regular cleaning if ceramic filter can be done by brushing off sediments stuck on it, the carbon module should be replaced once water output from it contains chlorine. A chlorine tester should costs around RM3 and can be used for years..

just my 2 cents....