Fresh Water RO ? - Page 2 - The Planted Tank Forum
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post #16 of 17 (permalink) Old 04-10-2018, 06:08 PM
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Whether you using RO or RO/DI you will need to remineralize. RO will just require a tiny bit less of remineralization. You do it based on the target GH you want. Then you just use ferts like normal.

Although honestly if you don't need a very specific GH for finicky shrimp I wouldn't bother and use regular tap for the water change and keep ro/di water just for ato purposes. Using 0 tds water on the ATO will keep the TDS from spiking as water evaporates.

My RO/DI creation is fully automated. I can give you a quick rundown on what's needed if you want to try that route.
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post #17 of 17 (permalink) Old 04-11-2018, 08:04 AM
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Originally Posted by Westone View Post
I have a 90G Planted tank w/ a 20G sump filter, C02 & 10G ATO, automatically dosed with GLA PPS-Pro fertilizers (Plantex CSM + B, Potassium Nitrate, Mono Potassium Phosphate, Potassium Sulfate, Magnesium Sulfate)

I was shopping parts at BRS to put together a three stage chloramine filter to plumb my municipal water supply directly to the ATO tank, and thus avoid pre-treating and lugging jugs of water from the kitchen. The parts quickly added up to the cost of the entry level BRS 4 Stage 75GPD RO/DI system, not to mention a trip to the home center for fittings and the effort to put it all together.

RO/DI is not the direction I was going. If RO/DI water goes into a FW Planted tank, and the GLA fertilizers are dosed at the appropriate level, will the water contain all the minerals and elements the fish and plants need to thrive? Or is something else needed, or is RO/DI simply not appropriate for FW planted tanks?

For ATO, I'd go with the RO/DI and either take water from the RO output, or put a carbon cartridge in place of the DI cartridge. For chloramines, just buy some sodium thiosulfate from Amazon and add this to your tank when you do water changes with tap water. I made a calculator for neutralizing chlorine, chloramine or bleach with sodium thiosulfate. Usually, I am lazy and just throw in a few grams when doing water changes since excess is not harmful in my experience.

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