10-29-2006, 12:44 PM
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You will see the better high end RO/DI filters in the high end LFS/LPS. Places like Petsmart or Petco only buy those cheap filters that does not remove allot of the minerals. Since you will eventually go with salt water, look into buying an RO/DI unit that removes 99% of the particulates in the water. These units are at minimum, 3 stage units. Don't forget, RO/DI units produce the water in gallons/liters per day, so it will take a LONG time to produce enough water to fill a tank. So you can select between 30 GPD (Gallon per day) or 60 GPD units for example. Therefore, you will need to store the water, so make sure you look into a water storage container. You can use food grade water drums, but they are usually expensive. Most people just use garbage cans made by Rubber Made.
FYI, RO/DI units produce allot of waste water, so it's normally best to plumb the system close to a fresh water pipe and also a drainage pipe. Allot of people I know use the waste water created, which contains allot of the minerals, for their planted tanks, FW aquariums, watering household plants. I even know a guy who raises CBW (california black worms) with the waste water.