Cali Kid Corals

RO filter advice please

I have a 5 stage RODI system and use a 1 micron poly sediment filter from the filterguys.biz as my first stage. I first started using my RODI around December last year, and I'm surprised that it already looks like this:

20080329_RODI.jpg


I took that pic this morning. Is this expected after 4 months? I live in SF, and so far have noticed my tap water TDS to be really low, from 20-80. I'm not sure how many gallons I've produced, but I've been light on the water changes if anything. How often do you guys replace your filters? Should I use a different sediment filter?
 
Depends on how much water you are using and how much sediment is in your water. I have a few units that need the sediment cartridge changed every 3 months, some can go a year. I'd change it out, their cheap.
 
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