I change my filters every 6 months carbon+ sediment. My tds meter reads 670 in and 14 out . I have a post di filter but have not used it because I did not notice any differance.
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125 gal center overflow 65 gal sump/ refug two 400 watt mh and two pc 65 watt aqua c 240 ev skimmer. mag 1800 return and mag 1200 for skimmer scwd wave maker 200lbs live rock.
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