You can effortlessly replenish storage water as often as you like with fresh water, using the old water for your garden.
Fresh water enters the storage drum through a pressure reducer in the inlet adapter.
Pressure must be reduced below the maximum internal psi rating of the drum. The fresh water mixes with stale water in the drum, flushing water out through the outlet adapter into another hose connected there and running to where the water can be used without waste, i.e., to a lawn, garden, etc. This normally takes between 30 to 40 minutes. Installation of the two adapters normally takes about 15-minutes.