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Old 04-29-2019, 03:52 PM   #11
ZxC
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Originally Posted by magedsabri View Post
I never thought about TDS honestly! I'm not an expert in the hobby , I always make a weekly water change around 10 to 20%, I never faced major issues with my small old tank, I'm planning to do around 15% weekly water change for my new setup, will this work or shall I get a new RO system to feed my ATO storage tank
Get an RO unit for the top ups. Tap water is perfectly fine for water changes.
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Old 04-29-2019, 04:21 PM   #12
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Get an RO unit for the top ups. Tap water is perfectly fine for water changes.
Sorry for a stupid question , why tap water is fine for water changes but not for top ups
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Old 04-29-2019, 04:34 PM   #13
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Originally Posted by magedsabri View Post
Sorry for a stupid question , why tap water is fine for water changes but not for top ups
Water change = removal of water with slightly higher TDS to be replaced with water slightly lower in TDS = stable TDS.

Top ups = addition of water with slightly lower TDS than the tank, but NO REMOVAL of higher TDS water from the tank.

100 gallon tank, 250ppm TDS.
50% weekly water change with tap water that is 200ppm in TDS = 225ppm TDS after the water change (250 + 200 = 450 / 2 = 225).

As organics dissolve into the water throughout the week, it will slowly rise back to 250ppm and then drop back down to 225 after the water change.

If you top up with tap water, you are adding more dissolved solids, but not removing any via a water change.
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