[Fish Guy84]

Hi there,
I have been considering getting a rodi unit because I'm tired of ammonia phosphate and high ph from tap water plus I want to eliminate the use of chemicals I have to add to tap water. (Prime and Neutral Regulator) What supplements do I need to add to re mineralize the water and what is the best holding container. I plan on getting a 135g whenever I can get my hands on one. These days it's difficult due to shipping and I live in Canada. As of right now I have a 15g and a 33g. How fast can they produce water? So many questions lol.

 

[Miller2112]

I am new to fresh water but i also have been using RO/DOI since its what i am used to with my reef tanks. I use seachem equalibrium.
As for a holding container i use the grey brute trash cans from home depot.
How fast they produce water depends on the unit you buy. The most common are 75GPD and 100GPD. I have always used 75GPD as they tend to be the most efficient

 

[niget2002]

I used rodi for my reef tank, but haven't set it back up since moving. I have a 75gpd unit and use a booster pump. I stored my water in a 55 gallon food safe drum.

You'll need somewhere for the waste water to go. I had mine run to my swimming pool.

Sent from my LM-G820 using Tapatalk

 

[MJB13]

Salty Shrimp Gh+ for remineralization. Powdered stuff gives you more for your $$$. Liquids are generally too weak unless you have a 2 or 3 gallon tank.

 

[ichthyogeek]

I was told to use Seachem Equilibrium to remineralize the water, and then to also use Seachem Alkaline and Acid Buffers to change the kh/gh accordingly.

Here is a little spreadsheet I compiled for 4 stage units giving price comparisons and such.:

https://docs.google.com/spreadsheets/d/1QSU2NRJ6Mpl0IUPEU_dfDIze7kRu8I5vv9__GC8V498/edit?usp=sharing

 

[mboley]

Here's a paragraph from Dennis Wong' 2 hr Aquarist site:

Raising the GH without raising the KH can be done using calcium/magnesium sulphate; CaSO4 and MgSO4. Raising KH without raising GH can be done using potassium carbonate K2CO3.

I found this to be the cheapest and most efficient way to remineralize. So all you need is these three chemicals and a scale. You have control over the hardness you want with the cal/ mag sulfates and you set the Kh with the K2co3. I dissolve each separately in a 5 gallon bucket of RO water before mixing in my 30 gallon drum. I found that if you mix in the cal and mag at the same time there is a reaction that affect dissolution.

 

[cl3537]

you set the Kh with the K2co3.

That works if you can get it, or just use Sodium Bicarbonate (Food Grade Baking Soda) if you can't. Some people worry about the Sodium but at reasonable dkH < 4 I wouldn't.