EE Eleven Master 36-watt UV Ultraviolet Sterilizer Light for Aqaurium and Fish Koi Pond,with a Spare Replace UV Bulb

I am using this on a 125 gallon aquarium. I had serious problems with algae. Changes in water only helped briefly. It was easy to install. Once installed the water was perfectly clear after about 24 hrs. I am very pleased with this purchase. I

This is a well designed and sturdy unit. Two bulbs a BONUS!Customer support (Ella) is outstanding and very responsive.I would recommend this to others.

O ring material is poor. Replace with real gasket material or expect product to leak and short out within the first hour of operation.

Since installing my UV light my pond has been so clear that it looks like drinking water. My koi have never been more happy.

I am very impressed with this UV clarifier.I have a small pond and used to have problems with algae for years,and it cleared up my pond within 3 days.so amazing,now i can see my fish again.Well worth the money.

Good