How much water can a smart IC card water meter store at most?

This IC card water meter is of the same nature as the current natural gas IC card meter. You can deposit any amount equivalent to the water price, such as 3.20 yuan/ton, 320 yuan100t, with no upper limit. However, this kind of water meter has been replaced in many cities, because in some cities, the weather is hot in summer, but the tap water is very cold, which leads to water droplets on the surface of the water meter, and the water droplets contact the sensors on the surface of the water meter, which easily leads to inaccurate data transmission.