Review on Get Cleaner & Healthier Water with GRECH CBG-800 5W UV Sterilizer Hang-On Back Filter for 20-50 gallon/211 GPH – Black by Rachel Brown

To say I'm disappointed with this filter would be an understatement. First, the device didn't come with instructions, so I had to search YouTube for videos on how to properly assemble and get it working. Second, the device is noisy! The surface skimmer had to be removed due to the noise and yet the unit rattles and belches constantly, even after the water flow is stopped. Most importantly and why I gave this product 1 star is that the most important feature for me, UV light, does not work right out of the box making it basically useless for my needs. I could spend half the money on a better non-UV filter. If I don't hear back from the supplier, this unit will be returned to Revain for a refund. **Updated 9/8/21** The impeller decided it would just stop spinning today. The block of flats is so hot that I'm surprised the fire didn't start. This product is not only crudely made, but also incredibly dangerous. Do not buy this product or anything from this company!