Using RO Water in a Planted Aquarium
Discus 10 years ago 32,433 views
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10. comment for Using RO Water in a Planted Aquarium
What he's doing here is taking near pure water with no hardness at all to begin with, then he's adding the hardness back to it. The benefit of that is you know how much is in there of calcium and magnesium.
My water here is 14GH and is comprised of mostly calcium, but has trace magnesium - which isn't good. You can does epsom salts (MGSO4) to get the ratio right, however, this also raises your overall GH.
Given a few big water changes like this over the months without checking could see the KH drop out and the PH crash.
As an example, my tap water has a TDS of 250, the unit filters water down to below 10 TDS, so you need to consider how much TDS is being washed out the waste - A LOT!
My waste water from the unit has a TDS of over 380. Imagine running that back through the filter. It now has to give you <10TDS pure water, but has to get that from what is effectively now liquid rock.
Like he said, this water is toxic to drink, or give to pets. I'm not so convinced it can't be used on the garden, because I do and my geraniums are exploding. Probably helped by the fact I rinse my filter mediums in that water.
20. comment for Using RO Water in a Planted Aquarium
IIRC my RO on its own is around 6.0PH.
I then inject pressurised CO2 which drops it to 6.6 - 6.4ph.
If you are cutting with tap water, there shouldn't be any problems. If you are using straight RO water and reminerlising then the KH/GH would be far more important to consider than the PH.
How about the KH? How can I obtain good levels of KH with RO water. It seems the Equilibrium Seachem item, only takes care of the GH....(?) Please advise.
-Mauricio
30. comment for Using RO Water in a Planted Aquarium
To be fair, it does look like a very nice unit, but meh, it's not there to be looked at really, is it?
The problem of using RO units is the cost effectiveness.
They tend to be a very expensive way to fight algae.
Most of the water gets wasted, in marine tanks this is almost mandatory to to keep your expensive corals alive but you can keep healthy algae free plants without RO water.
Still for he who can afford it there is benefits to it.
If someone can't justify £2 a month, then I don't think aquariums are the hobby for that person.