What Tank do I need for a DIY RODI kit?

A tank based system provides much better water flow than a traditional RODI cart. But choosing a tank isn't easy. There are a few decisions to make when choosing a tank.

1) Size

The size of the tank determines how much water you can bring to the job if there is no water accessible. The larger the tank the more water you can bring with you.

It also determines how much time you have before running out of water and waiting on RO production.

If you have a 50 gal tank and are pushing 2 GPM to the brush,  you have about 25 minutes of spray time before the tank is empty.

If you produce water at the same time, you can take the net difference. So if you draw 2 gpm out to the brush, but produce 2 gpm of RO water into the tank,  the net is 0 gpm of draw. This is zero down time as long as you are producing water.

If you draw water at 3 gpm and produce at 2 gpm, you net 1 gpm out of the tank. This allows you to spray continuously for about 50 minutes before the tank is empty. 

The bigger the tank, the more time you have in each of the above examples. Let's double the tank size to 100 for easy math. Now that’s 100 minutes of spray time at a net draw of 1 gpm. (3 gpm delivery - 2 gpm of production).

Keep in mind if you stop spraying for any reason, IE move to another panel / side. The tank is filling back up at full RO production rate. IE, take a break for 10 minutes. the RO water can refill 20 gallons. 

The most popular size is a 50-55 gal vertical tank. Its about 4 feet tall and around 16-20 inches on each side. (Similar to the tank above)

2) Orientation

3) Fittings

Many tanks come with 3/4 in or 1 inch bulkhead fittings. You will need to reduce that down to 1/2inch NPT threads to use our fittings in the DIY Kits.

If you can, get 1/2in fittings on your tank for easier installation.