If you are a long-haired individual, a pet owner (pet fur also melts!), or someone tired of standing in two inches of shower water, this product is a genuine solution. It is potent, fast, and cost-effective compared to an emergency plumber fee (which can run $200+).
Around £5-£10, depending on the retailer and location.
The standard 450ml hair-specific version is often a one-application treatment (using two bottles provided in the kit).