Flow rate here mean with which rate or the speed the water is coming out of the faucet. Or we can simply say the measure for the water which is coming in a specific time. Flow rate is very important. because depending on this only we can get the best results. A too high flow rate and too slow, both are not good. And sometimes, for different application there is need for a different flow rate. And this is the aspect which is looked mostly by the customers.
So generally it is considered that of water is running at more than a trickle and less than explosive. Then it is considered to be working in a fine order. But this is not the ideal case. Your water flow would be at inappropriate gauge if it is running out of heat. And in case if you are using water softener at an inappropriate rate, then you are missing the clean water before you are reaching it. So, flow rate is very important from all this perspective and you will have to choose at proper kitchen faucet with a good flow rate.
This flow rate is holding more important than just a single point. So, if you are having a water softener, it would take time to clean the water. Similar would happen if you are having a water heating system, it would take some time to warm the water. And if both the system are too small then there would not be enough capacity for water and in that case you have to control the flow rate and if you are not controlling it, you will get all the soft and warn water wasted because it would flow out before your reach. So, not only from cleaning and rinsing purpose, the flow rate hold importance in other perspective also.
If we look at the average flow rate, than it is 2.2 gallon per minute. This is specifically for the kitchen. In bathroom the flow is more restricted and it is up to 1.5 gallon or sometime .5 gallon per minute. And the average consumption of water by a person through faucet is 20 gallon. You can increase the flow by using larger aerator and in the same way can slow down the flow. Increasing the flow will give you a sharp water stream that will help you to clean deep.