If you re running on that height gravity feed a pneu tank by itself I reckon wont help it ll just fill to the pressure available IE that height of gravity and
things will remain the same. Only way to increase pressure if thats all you have is to put in a pump. Only reason to have a reserve tank is if you re boosting their supply
you dont want to come home to find damaged pump cos they turned everyones water off for 1/2 hr whilst dicking around with the supply cos they usually dont tell you.
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