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Your options would be a reverse osmosis unit, or buying RO/DI water at the grocery store. It depends on how big a tank (& how much water you use) as to which is more cost effective.
Using RO water would require you to add back the minerals needed for fish/plants (and also buffering capacity). You can use a commercial mix, or just mix in some of your tap. (Your plants will need some nitrates anyhow.)
If your tap is truly off the scale in nitrates, you might consider getting the RO unit so you can use it for drinking water as well. But I agree with the Captain, check with your water co. (or if you are using a well, have the water professionally tested.) Make sure your test result isn't way off before spending $$.
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80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.
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