I need to add a new DI tank to one of my vehicles and it needs to be smaller than a 1/2 cubic foot for space reasons. This will be used after an RO membrane. I know some will recommend I just buy something ready to go but first I want to compare two sizes of DIY tanks…a 20x2.5 inch and a 20x4.5 inch (big blue), both with refillable cartridge inserts. I know the obvious advantages and disadvantages (mainly initial cost, size, weight, and frequency of changing resin differ between the two). I have two specific questions…
Is there going to be a flow rate difference?
Does anyone know the exact amount of resin that fits in each respective tank? I’ve seen a range of 24 to 32 oz for the smaller tank and 6.5 to 7 lbs for the larger, but would like verification.
Yes, just take your height of 20" times Pi times R(square) where Pi is 3.14 and R is the radius of your cylinder. This will give you the volume in cubic inches. To get cubic foot, divide this by 12 three times.
that means there is roughly 736 oz in a cubic foot of resin.
there are 1728 cubic inches in a cubic foot.
that means a cubic inch of resin weights .43 oz.
a 4’x20" cartridge will hold 251 cubic inches, or roughly 108 oz. of resin.
a 2.5"x20" cartridge will hold 98 cubic inches, or roughly 42 oz of resin.