Water Tank Volume Question

[gary.hdez]

I have my pump and CSV on order and am on the fence between two tank sizes. One is a 300g and the other is a 400g. They both have the same footprint, which is 29"x 66". Doing some rough math, if I have a float switch to shut off the pump when the tank is down to 6", I would be losing roughly 45g of volume. I can probably run it down to 4" and will only lose 30g. If those numbers are right, I will just get the 400g. Do they sound right?

 

[Fitter30]

29x66= 1914 cu in
1914÷231 cu in gallon
4"= 33.14g
6"= 49.71g

 

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[Valveman]

When it comes to a cistern or storage tank, if you have a choice, larger is always best.