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Old 03-20-2004, 12:39 AM   #1
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RO units?

I dont have a lot of algae in my 150 reef. it grows on the rocks some, but its more just discoloring them to a dull brown over a period of months. i dont have hair algae, and its all brown.
do i need a reverse osmosis unit? i live in boston MA if that helps.
is a 3 stage significantly better than 2 stage?
is 4 stage necessary?

please advise before i do something to feel trendy.
joe
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Old 03-20-2004, 06:04 AM   #2
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Sounds like diatoms to me. These are probably due to silicates in the tap water. An RO unit is a good thing to have...it insures that you get only pure water with no contaminants. A 2 stage usually has a sediment/carbon combo and the RO membrane. A 3 stage will have separate sediment and carbon filters. It will require less frequent filter changes. The 4 stage incorporates a DI cartridge. The DI removes what the RO membrane misses. It is generally recommended to buy a unit with DI because it will give you water that is very pure.
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