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Old 10-22-2009, 01:26 PM   #1
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When to change the DI filter

How much of the filter needs to change colour before you change the filter? About the bottom 25% of mine has changed to a rusty red, but it hasn't moved from there for a while. Should I change it when it reaches about 75-80%, or what?

Sorry for the question, but I've never had an RO/DI unit before this one. I was a freshy before, so I never used one.
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Old 10-22-2009, 03:10 PM   #2
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Do you have a TDS meter hooked to it? If you don't I would probaly change it when it reaches about 75-80% like you said.
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Old 10-22-2009, 03:40 PM   #3
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I'm gonna see if I can get a TDS meter that isn't too expensive. If it costs too much it would just be cheaper in the end to change the filters more often
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Old 10-22-2009, 04:01 PM   #4
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A dual meter that has a probe before and after DI is about $30 and a pen style is about $20. IMAO the dual meter is the way to go. I look at it like that is the cost of a nice frag and I know for sure what is going in my tank. Just my opinion.
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Old 10-22-2009, 04:04 PM   #5
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If they are about $20 then I may pick on up. Don't really care how bad the water is going in.....just that it comes out clean

Seeing that I've only done about 180G of water so far....that 25% of discolouration may mean my tap water is as dirty as Britney Spears before the intervention
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Old 10-22-2009, 08:58 PM   #6
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I usually change mine when it`s about 90%. It usually last about 6-8 months.
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