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There is another option to purify water without producing any waste water. If ONLY you feel that you are more comfortable with chemistry than witn plumbing, you can use deionization (DI) resin to purify water and then recharge it using chemicals that you can by at walmart or any household supply store to use that resin again and again. There was a thread here on Reef Central where you can find detailed description how to do that. One of my local fish store sell water that was purified that way. TDS reader allways shows 0ppm and I used that water many times as a top off water or for mixing my own salt water. So, I can tell that it's as pure as it can only be. The owner of that LFS is former chemistry sientist and he sell that water dirt cheap like $1.00 for 5 gal. So, that might be an option for you. Just need to be really careful with chemicals which is pretty obvious of course. Good luck with your project.
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