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Old 11-30-2004, 11:26 PM   #11
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PO4 is removed from by the R/O and the DI. Basically it is a negatively charged resin that attracts positively chared ions. Once it's full the heavier molecules are attracted and break off the weaker bonds and they are released into your water. PO4 is a weaker bond. Example: your R/O membrane fills up and the next lead particle comes along and sticks to the resin and knocks off a PO4 molecule. The DI cartrige will also remove anything the R/O membrane left behind. You can have a full R/O membrane and still get a TDS reading of zero with a new DI cartridge. However you will quickly use up your DI and have to replace it often. They are supposed to work as a team. All cartriges should be changed at the same time when the TDS reading begins to climb.

This info per B. Stone, Indiana State Water Board Member and fellow reefer.


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Old 12-01-2004, 09:31 AM   #12
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Good advice but I have to say everyone's water is different. I have to change out the micron/sediment filter after 2-3 months and the carbon around 5 months and the DI depending on what time of year can last 4-8 months. So you will need a TDS meter and watch your filters.
I have clear housings which makes this easy. I can see when the sediment is full and when thats full the carbon after it starts to get dirty.
So IMO changing all filters at the same time is not needed. this has been my experience.

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Old 12-01-2004, 11:05 AM   #13
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You really should use a TDS meter to detemine if in fact your DI cartridge needs replacing/recharging. Also depending on your R/O system, you should have pre-filters before the water hits the membrane. This would go a far way towards preserving the life of the membrane itself. HTH

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