one!
this works great on my vanity sinks. i have two that constantly plug and the way i fixed it previously was time consuming and required taking the drain apart. it was nasty & messy,. with this, the messy part of the chore is gone but the gunk it breaks up from the drain still gets pulled in to the sink so it's still nasty. the task is much quicker with this and this is just the right size for those types of sinks.
it is a good one for your home. it is small and easy to access small spaces like kitchen sink, or bathroom sink, right under the faucet, it 