Several great additives out there to keep the algae from growing. But you will still want to take sample every now and then it is sits up much. After you use it for a while you will know how much diesel you burn per hour with drive and gen set and you could calculate time you plan on spending out plus 10% and just put that much. Our post held around 500 gals and we would rarely take on more than 200 to 250.
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