RO/DI systems

[Kye tank]

Hi,

I just watched a video on RO/ID systems. I have a couple of questions, one can I send mixed saltwater through it an it keep the salinity mix and not harm the water? The second is could I put it on the side of my tank and let it run to help clean the water in the aquarium because the water did not go through it before going into the tank? it only got treated

Thank for your help.

 

[Daddy-o]

No & No

 

[Osric]

RO/DI is for treating your tap water, you’ll need to make enough water to do an 100% water change on your tank. If there is a problem you’re solving, you might think about changing 20% daily until you’ve diluted the original water into oblivion.

 

[Reef-junky]

Just the DI part alone would take salt out of water because it’s ionic. My guess is you would burn though the DI resin. Not sure what salt water would do to an RO membrane. My guess would be mineral scale build up.

 

[AZMSGT]

It's for filtering TAP WATER. Not tank water. If your water inside the tank has never been treated then after you start making RODI water you can start replacing your aquarium water through large regular water changes.

Don't forget that fresh RODI water needs to have the salt added to it and mixed properly.

You can start adding the RODI water direct to the aquarium to replace water lost through evaporation.

 

[Reef-junky]

Best bet is to do this ^^^

 

[Osric]

Best bet is to do this ^^^

If by "do this" you mean just use RO/DI for top off, I disagree. If you mean do large regular water changes, I agree. Your post is a bit ambiguous because the post above suggests both options.

Just doing top-off will not dilute the problem, assuming the OP has a problem, which hasn't been confirmed.

 

[Reef-junky]

I mean do both

 

[Mical]

What everyone is saying - use RODI to make your top off water & for your fresh saltwater.(for water changes) It's not for filtering saltwater or pumping saltwater.

 

[george51349]

Welcome to R2R! RODI units filter almost everything out of the water.

 

[Kye tank]

Thank you all for advice, I'm doing the 20 percent ish a couple of times a week, I plan on doing 5 to 6 total to hopefully fix what I did. The problem I'm trying to fix is brown algae build up an its getting worse. So I'm using a 32gal trashcan with RO/DI water.

 

[Osric]

You may be underestimating how many water changes you need to fix your issue. You should measure nitrates (and other parameters) and post your test results here for more help. Also siphoning out the algae as much as possible during water changes should assist, and if you have nothing requiring a ton of light in your aquarium reducing the photoperiod to something really short while you fight the outbreak may help.

Let's say for example you have 30ppm nitrates and wish to reduce them to 1PPM. This will require 15 iterations of a 20% water change:

Water Change #	PPM
0	30.0
1	24.0
2	19.2
3	15.4
4	12.3
5	9.8
6	7.9
7	6.3
8	5.0
9	4.0
10	3.2
11	2.6
12	2.1
13	1.6
14	1.3
15	1.1