Just remember that when filling direct from the tap to treat for the whole tank and not just the amount that your replacing.
When the dose goes into the tank it`s a certain amount of prime for X amount of impurities in a certain volume of water.So when you add those impurities to a larger volume you will need the extra prime to be able to cover that volume and not the amount of water replaced... If that makes any sense??
It`s 1 to many beers on a sat night and i`m short on the right phrasing but i`ll be better tomorrow.. lol
When the dose goes into the tank it`s a certain amount of prime for X amount of impurities in a certain volume of water.So when you add those impurities to a larger volume you will need the extra prime to be able to cover that volume and not the amount of water replaced... If that makes any sense??
It`s 1 to many beers on a sat night and i`m short on the right phrasing but i`ll be better tomorrow.. lol

Geezzz!!