Don’t bother… Keep 1 tank with clean and another with dirty. There are plenty of cooking recipes that use water instead of clean so, in reality, with 1 tank of each you are set. The weather region simmulated in the game is USA New England, so even in middle summer rains close to 30% of the time while snow in the winter doesn’t alter the summer figure much neither, so for as long as everything is functional, your dirty water tank will fill up BEFORE you have time to spend its equivalent in clear water (I repeat if you use directly water in the recipes that allow BOTH).
I know that it sounds counterproductive to spend time having to cook clean water when purification is so time-efficient. If you are using recent experimentals, and want to keep using your 3 tank setup you can do the following:
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Let one of the clean tanks to empty.
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Purify the dirty.
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Get the ruber hose, use “siphon” on vehicle examine menu.
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When the menu on what to do appears, select pour into a nearby vehicle.
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The system will automatically fill up the remaining empty tank with the clean water.
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It should work also to partially refil any clean tank if you don’t mind that the remaining clean water turns dirty the next time it rains so you don’t have to wait for an empty clean tank but not at home atm to check specifically this combo… I always refill tanks after they empty completely.
