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Old 01/09/2008, 10:17 AM   #3
MarineFishGuy
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Join Date: Jun 2002
Location: Central Oh-io
Posts: 804
I used to think DI did not do a whole lot until I did some testing with my TDS meter.

Before DI after RO: 35
After DI: 0

I intend to replace my RO membrane once I finish paying off my credit cards from Christmas, but it is in good shape (no visible tears) and is only 6 months old). However my percentage of removal is somewhat low.

However most people consider 35 too high for TDS. Although my final output after DI is 0.

You can get add-on DI cartridges from Buckeye Field Supply. This would be cheap insurance.

You may want to back off on feeding a bit too, that is where many phosphates come from.

HTH,
Ken
PS I get the film too every couple of days, I just clean it with a magfloat.


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