Switching to RO/DI water. Tips please. - The Planted Tank Forum
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post #1 of 3 (permalink) Old 08-19-2018, 02:45 AM Thread Starter
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Switching to RO/DI water. Tips please.

Well I finally dished out some cash for a RO/DI unit since my tap water is off the charts with nitrates. I have some Seachem Equilibrium and Seachem Alkaline Buffer and plan to pre-dose for 5dh and 5dkh, not sure what pH that will end up, or if this hardness is good for my fish and shrimp. My current water is spring water from the store. Tank water is 7.6ph with Co2 off, 7ph with co2 at 30ppm.

I do not know the hardness of my water as my hardness tests I have are out of date as well as the ones on the shelves in my local stores (which is pathetic), I didn't bother with getting one online due to the chance those are out of date as well.

Here's my worry, I don't want to shock my shrimp/fish with a pH crash or large hardness change.

Question 1: What GH and KH should I aim at, should they be near the same? At what point am I risking a pH crash?

Question 2: How fast should I convert over to the new water? 10% water changes daily over two weeks or 30% every week like my normal water changes?

Current Tank info:
Inhabitants 60+ RCS, 1 female Clown pleco, 1 male honey DG.
Co2 injected 30ppm 7 hours a day.
PH is 7.6 without co2.
Phosphate .5-1ppm from mostly from food and dosed if it drops too low.
Potassium 5-15ppm
Iron is dosed.
Magnesium is very very low due to spring water, one of the reasons for picking Equilibrium in RO water.
Silicate 0ppm
Nitrate 5-15ppm (has to be dosed sometimes)
Micro's are dosed.
Temp 76
Lighting Finnex planted+ set for 8 hours at 60% brightness, and added some 460nm and 660nm LED's on dim.
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post #2 of 3 (permalink) Old 08-19-2018, 06:50 AM
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what substrate are you using? active or inert?

i remineralize with saltyshrimp gh/kh+ for my tank with inert gravel. i remineralize to 3 KH and 6 GH. that comes up to a TDS of around 180 ish.

dont bother adding Prime. some people choose to age the ro/di water, but i dont.

i believe you change whatever amount of water you please, but i'd drip it in very slowly (and for longer duration if changing a large amount), especially if there is big difference in water parameters, temp and TDS between your tank water and your new water.

u can also try reducing nitrates by adding floating plants. i also dose microbe lift special blend to help with the nitrogen cycle end products.

there are 2 rules to success in life.
rule 1 - don't tell people everything.
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post #3 of 3 (permalink) Old 08-19-2018, 01:34 PM
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I would get a tds meter. Depending on how warm your tanks are a heater could be needed. Mine is set up in my basement and its cool

Adjust slowly

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