RO/Di Water Question

[gerridee]

I have a Ro/di water filter purchased and on its way to me..Im Realizing illl have to correct the waters Ph since my well water has a low Ph at 5.7.Anything else i need to know?? Thanks

 

[Fishguy2727]

Any RO water needs to be buffered. RO/DI water should have a TDS of 0, this means it doesn't have ANYTHING in it, it won't even conduct electricity. What are you using the water for?

 

[gerridee]

Any RO water needs to be buffered. RO/DI water should have a TDS of 0, this means it doesn't have ANYTHING in it, it won't even conduct electricity. What are you using the water for?

Reef tank 75 gal

 

[melosu58]

When you add the salt mix it will buffer it. After you make a batch of it then check your PH. It should be OK but if not they make a buffer for it.

 

[gerridee]

When you add the salt mix it will buffer it. After you make a batch of it then check your PH. It should be OK but if not they make a buffer for it.

Thanks, That helps alot....and for top off water, just correct the PH.Correct?

 

[MikeYQM]

I use pure RO/DI to top off, the check & buffer the tank as a whole.

 

[gerridee]

I use pure RO/DI to top off, the check & buffer the tank as a whole.

Thanks but my RoDi water will have a low PH. from my wellwater at 5.7. i need to buffer before adding to tank

 

[melosu58]

At the beginning I would just add the water and then check your PH of the tank water. If you see it falling then maybe add the buffer. I think you should be OK though. Remember the SW already in the tank will be buffered because of the salt mix. Add some FW and check your PH about 6 or 8 hours later.

 

[MikeYQM]

How often & how much volume do you top up?

In my case, it's such a small percentage of the overall volume that the buffering capacity of the water left in the tank keeps it stable at 8.3.

 

[Fishguy2727]

You top off as needed, to keep the tank full from evaporation.

It doesn't matter what the source water is, hard or soft after RO/DI it will be as soft as possible, no matter where it starts. As stated already, a proper salt mix will adjust pH/KH, Ca, Mg, etc.

You do not need to alter top off water. It replaces evaporation which is only water, nothing else leaves. So it should be nothing but water going back in.

 

[rdnelson99]

If I could jump in here and ask for a clarification on something I have suspected for a while but never heard addressed. If in fact the RO/DI removes everything, is there a need to condition the water for chlorine before mixing? I mean 0 is 0 right? I have continued to treat my RO/DI water but I think it is a waste.

 

[Fishguy2727]

No, no need. It is removed (by the carbon stage(s)).

 

[rdnelson99]

No, no need. It is removed (by the carbon stage(s)).

Thanks. I always wondered about that.