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Old 02-18-2009, 11:56 AM   #1
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When to change RO/Di filters?

I have melev's reef 100gph Ro/DI.

I was curious as to when I needed to replace especially the DI filter part. On his website he says 6 months to a year but also mentions color change and it may vary due to the lack of or the amount of impurities in the water. So far I've made about 50-60 gallons total and I'm seeing a color change ( see below) - is this normal? Or will I have to change the filters sooner?

I read a TDS meter is the best way to tell, but was curious about the color change. Add TDS meter to the to buy list!
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Old 02-18-2009, 12:04 PM   #2
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How long have you had your RO Unit for?
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Old 02-18-2009, 12:15 PM   #3
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I've had it since christmas. I only started using it in late Jan / the beginning of Feb due to below freezing temps.
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Old 02-18-2009, 12:38 PM   #4
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I just change my filters every 6 months. The membrane every two yrs and the DI part every yr. Yes a TDS meter would tell you.
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Old 02-18-2009, 12:53 PM   #5
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Ok Thanks I'll keep an eye on it and just plan to change in a few more months.
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Old 02-18-2009, 01:10 PM   #6
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TDS meters are cheap and a great investment. $15-$20
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Old 02-18-2009, 02:18 PM   #7
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Ill look into getting one. Thanks!
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