Question about pH and RO Water?

RedLion

RedLion

AC Members
Aug 25, 2009
92
0
6
Houston, TX
I have a 36 gallon tank and I was looking to invest in a RO system. Any suggestions on quality brands and a prefered output quantiy for my application would be appreciated. I am planning to upgrade to a 120 gallon tank in the future so I wanted equipment that would grow with the tank.

Also, I noticed my pH is has dropped down to 8.2 from 8.4. When should I try to raise it and what should I use?

Parameters:
Temp = 80 deg
S.G = 1.023
pH = 8.2
Ammonia\Nitrite = 0
Nitrate = 10 ppm
 
I have this one but its the 25/gpd version. Also, the one pictured is the Hi-S version which has added silicate filtration. I neve had an issue with silcates using my standard Maxxima. I have a 40 breeder and I change 5-gallons per week so this fits my needs just fine.

http://www.marinedepot.com/Kent_Mar...ms-Kent_Marine-KM1411-FIRORDFS-KM1413-vi.html

A pH of 8.2 is fine. pH is going to fluctuate over the course of a day up and down. You will see the biggest change after the lights go out. I would not worry about buffering pH if you are fairly regular with your WC schedule and use a consistent water source.
 
ebay is definitely a good place to save. The bare bone version is RO only (No DI filtration component).
 
I recommend this setup as opposed to the others: http://www.bulkreefsupply.com/RO/DI...-75GDP-RO/DI-5-Stage-System/product_info.html


It is very reasonably priced for 4 stages and uses a membrane that features a 98% or more rejection rate. The DI resin is nuclear grade and is decent quality--certainly better than what comes in the Oceanic unit, which actually has a sodium exchange resin--meaning your product water will have sodium in it. The parts are well-known and widely used, as well, compared to these other units and can be found cheaply practically everywhere. I realize 75 gpd seems a bit much, but you'd be surprised how much you'll need. Besides, in an emergency, you'll need all the water you can get. Always get a unit that is rated for more than you think you'll need.
 
The only thing I would add is a storage tank. Mine is under my sink with a tank, so there is always 4 gallons ready when I need it, plus it makes the best coffee.
 
Quote: "The DI resin is nuclear grade and is decent quality--certainly better than what comes in the Oceanic unit, which actually has a sodium exchange resin--meaning your product water will have sodium in it."

What are the effects of having sodium in the product water due to the sodium exchange resin?

I only ask this because the LFS has this particular 50 gallon in stock and they say it will do the job. Will it prevent me from keeping any type of livestock?
 
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