So far I've heard of few people here using RO - Henry at Marine Life uses it for his personal aquariums tho. I use a DI (Deionising) unit at $70, recharging costs $50. The unit makes about 1700L before requiring recharging. RO is good if you can afford it, but caveats include slow water production and water wastage - ie you need about 5-6L of input water to produce 1L RO water. IMHO, DI water is quite good liao ... you can filter it through activated carbon or polyfilter before (to extgend lifespan of DI resin) or after (to make even purer water).
Just my 2c's worth!
Hong Yee








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