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the pre filters take out very little tds, all the work is done by the membrane. I must have pretty clean tap water because it takes months to notice any coloration change in my sediment filter....maybe your tap water is very clean too.....
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Please don't feed the bears because the bears will become dependent on free handouts and forget how to take care of themselves …...
Current Tank Info: 75 Gal. Mixed reef mostly sps
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