In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.

My son installed the faucet and it is working O.K. However, it is very difficult to install and it did not come with a tool like other faucet product. Also, the faucet color is coming off and collects a lots of white calcium in and around the edges.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
it is very difficult to install and it did not come with a tool like other faucet product