Preserving water

[max at gte.net]

- wrote:
> 
> I have a mobile home that uses water off of a 40 gallon storage tank.  This is
> refilled about once every 2-3 mos.  Being conscientious of potential microbe
> development during the storage period, I'd like to know how much chlorine I'll
> need to add to the tank to keep it 'sterile'.
> 
> Any suggestions?
> 
> Thanks.
> 
> May

You won't technically be keeping it "sterile", but to prevent biofilm 
buildup and bacteria growth you would want to keep .5 to 1.0 mg/l of 
Chlorine in the water. You can obtain a test kit from HACH company in 
Ames, Iowa.