CTUV-H4F

I wanted to wait and see how effective this UV filter was before writing a review.My 10 gallon aquarium always had a very bad problem with algae growth. I could clean it, replace the water but the algae would come back in about 2 weeks just as bad as before. I even had a UV bulb that I had placed in my regular TopFin filter but it didn't seem to work at all.I purchased the TARRARIUM CTUV-H4F (for 10-45 Gallon) UV filter back in April. I put it in and left it on 24/7 for about 2 weeks until I couldn't see any algae in the aquarium at all. I'm pleasantly surprised to say that it's been about 2-1/2 months and I haven't had to turn on the filter again. It's still in the aquarium (just in case), but I'm shocked at how well it worked. The internal foam filter was actually still clean after use.I recommend using this along with a regular aquarium filter. I would highly recommend this UV filter to anyone who has algae problems. I wish I had a before and after picture to show the results, but believe me, it really worked that great! It was really worth the price and now I can spend more time enjoying looking at the aquarium instead of cleaning it.

This filter is pretty dang amazing. I didn’t think it would work but I left it suctioned on the wall vertically, submersed in an 135 gallon turtle tank filled with about 80-100 gallons of water and the UV light on for 72 hours and the pea soup returned to broth. Am looking forward to seeing more clarity as the days go by. Came mostly assembled, just needed to plug in the air tube. Noise level is fine as it’s submersed. Can’t say much about the filtering quality without the UV as I’ve only used it with, but considering the methods my family has used prior to this filter, it seems to be working great. I also use it in conjunction with a Penn-Plax Cascade 1000 to cycle out the dead green :)

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.

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

I bought this for my turtle tank and I have to be honest this was the best I’ve ever seen the tank clear. I wish I would’ve taken a before but I forgot to. But what I can say is as far as being clear it does just that. As far as catching big debris it gets stuck at the back of the filter and doesn’t suck into it which could be a good thing. However the air pump won’t work for me which is a bummer but I have one in there already so I’m not as upset. The filter lets out very fast current so for fish I’d say no don’t get it BUT IF YOU HAVE A TURTLE THIS IS GREAT! And if you struggle with foggy water this is perfect! Just know it is very strong. So after the water clear just turn it off if you have small fish! And purchase a small air pump to have on for your fish.

I love this filter I can turn up the air flow and it makes bubbles or turn it down for a nice flow of water it was easy to put together ❤️

I'm so happy I can see my babies again!If you are genuinely wondering how in the world people are getting their fish tanks to look amazingly clear, look no further than this product. I have had it just under 24 hours and the difference already is astonishing. UV light. It's just light and somehow it does the trick. I couldn't see my fish at all, and was getting ready to change their water and boil everything in it for the second time this WEEK and here we are. It's not instantaneous but I noticed after 2-3 hours that I could see their pseudo-driftwood hidey hole again, and then their little fins.This is a great buy for someone who loves their little swimmers and wants to see them have their best life!