Question: How do we use the water for ablution without extravagance if the water runs continuously?
Answer: “water runs from the faucet in every place. So it is upon the one making ablution that when he opens the faucet that he does not open it with strength. Rather, he opens it in accordance to what suffices him.
When he is making ablution, he should not increase beyond three washes [of every limb]. So like that a person will not be an extravagant one. So he does not exceed the limit and he does not let the water flow powerfully such that a lot of water is wasted during the ablution”.
[Taken Sharh Sunan Abu Dawood no. 98]
Faisal Ibn Abdul Qaadir Ibn Hassan