Pump is designed to transfer water from the tank into the house under pressure. If there is no water in the tank there will be nothing to pump into your house.
That’s why we designed the booster box to keep the storage tank filled.
Lately, the pressure in the municipal feed system is not constant.
There are times when the pressure drops or disappears for a day or two.
Insufficient pressure doesn’t let the storage tank to get filled. If this situation carries on for a few days the water level in the storage tank will be dropping and eventually you will have to call a water truck.
Of course, you can fill the tank with buckets, although we do not find this idea delightful.