Small Pond Filter for 75-300 Gallon Tank, Aquarium U-V Filter Green Clean Machine Submersible Powerful Pump Canister Filter 600GPH for Fish Turtle Tank Saltwater Freshwater Crystal Clear Green Killing

This works exactly as described. I have 3 large tanks and got one for each tank. I use it with a regular tank filter system and it makes the water crystal clear. Before this i had problems with the water clarity, afterwards I haven't had any of those problems. I definitely recommend these. And tell everyone I know that has a tank to get one, it's well worth it in the long run. If I get any other tanks I will definitely get one for that tank too. Easy to take apart and clean. It's a must have if you have a fish tank.

So initially I installed this in my son's 10 gallon fish tank. It had WAY too powerful filtration...if you look it has a 10 watt pump which is in the range of 200gph filtration. So I took it out and went back to the hang on the tank filter.With 2 goldfish and 2 minnows in a 10 gallon tank, I eventually had an algae problem. I was replacing HOB filters clogged with algae every couple days and the water was still murky and algae out of control!I really didn't want to resort to chemical algecide on account of a fish kill incident early on in my learning about fish tanks. So I adapted some irrigation hose to make a diffuser for this pump's output and removed the sponge inlet filter (not recommended) just to see if the UV could help.I had it on for about 1/2 hour, and the fish were constantly freaking out. Also, I noticed the water had become more cloudy with lots of micro bubbles (Ozone?). I turned it off to calms the fish and just went back to depending on the HOB filter.Well, that was Friday, and watching the tank over the past couple days wondering what to do it has progressively gotten clearer like magic. Today (Sunday night) the water is crystal clear!!I think that in the 1/2 hour this filter ran, the UV light directly sterilized or added enough Ozone to completely kill the algae. Amazing!So for the videos that show how clear it gets over a few days.....it MIGHT actually do that even if it only runs for a little bit on day 1..... the rest may be overkill....in any case, extremely effective.

I have a 55 gallon freshwater and after cleaning it was very green. Probably moved all the algae up from the rock. Who knows.After 3 days of using this in the tank, it is now crystal clear.Works perfect.

This filter works really well on my 20-gallon saltwater tank. The UV light noticeably improves water clarity and helps with cloudiness. It’s quiet, reliable, and does its job.However, once I added filter floss, I had to change it every 48–72 hours. Each time I removed the filter to swap the floss, it stirred up detritus and clouded the tank instantly—leading to nitrate and nitrite spikes. It became frustrating and messy.I use a Seachem HOB filter on my 75-gallon, and it’s much easier to maintain without disrupting the tank. I recently ordered the Seachem 35 to replace this one.If you don’t plan to use filter floss or clean your filter often, this one will work just fine

This item worked well but for a very brief period. After about a month and cleaning the filter sp[onges, etc.], the filtration system now makes noise 24/7, and the airflow is slow to the point that I can blow bubbles in the water faster than this filter's output. The blue light also stopped working within three weeks of using it.I have had pet fish for nearly 35 years and have tried dozens of different filtration systems. I like this airflow and filtration style most, but this specific model did not have long-lasting quality. It lasted just enough time that the option to return it expired. Good luck!

Review updateThe company honored the warranty and sent me a replacement. This is the best filter for my turtle tank. It keeps his tank clear and is very easy to maintain.

This uv light has worked very well in my 75 gallon aquarium, I was dealing with cloudy water on a regular basis and it cleared it up in 2 days, also you can replace the uv light for around $22 when needed you don't need to buy a new unit

I purchased this 3 weeks ago and am extremely happy with how well it worked, I have well water that gets cloudy and green pretty quick after water changes even with chemical treatment, this UV filter had the water crystal clear within a week in a 40 gal tank and it has maintained the clarity. There are two reasons I did not give it 5 stars, first being the flow rate is not adjustable and it has a pretty strong flow, second, I have a lot of live plants and debris will get in the inlet area of the filter, if I shut the pump off to clean the filter the debris releases into the tank, I found I have to put a large net over it when turning off the pump. It is very quiet, hardly any noise. If they upgrade this with an adjustable flow it would be a definite 5+ star