Around here it's typical to use a 5000-gallon tank, but that size is necessary for fire sprinklers. You could go smaller. 9 gpm is pretty good. I'd go bigger than 300 gallons.
Poly Processing is the go-to company. Check out their website:
https://www.polyprocessing.com/tank-specifications/our-tank-offerings/vertical-tanks/
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Charlie
1966 912 Polo Red
1950 VW Bug
1983 VW Westfalia; 1989 VW Syncro Tristar Doka
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