Penn-PlaxUndergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25” Plates – Under Gravel System for Clear, Clean Water – Safe for Freshwater and Saltwater Tanks

The media could not be loaded. Back in the 80`s & 90`s, i used to keep fish, but had a break from it till 3 years ago, when i purchased my current setup. Back then, pretty much the only filter system around, was undergravel filters and they always worked great. Nowadays though, with modern systems, undergravel filters sort of died out, or so i thought. I have an Ocellaris 1400UV canister on my tank, which i have to say, does an amazing job, but because i`ve now had the tank 3 years, i decided to do a complete clean out of the tank and i have to say, i was blown away by how much muck was in this tank, especially in the gravel. One of the biggest causes of it, was the volcanic substrate i`d put in the tank when it was first setup, as it worked it`s way through the gravel, it had literally turned into lumps of mud and then along with all the other muck, well, you can imagine. So, after coming across these undergravel filters and the fact you could still buy one, i decided to fit this one to my take, because lets face it, you can`t have enough filtering. It all went together great and the only thing i had to do, was trim about 20mm off the width, because it was slightly wider than the tank (front to back). The kit comes with everything you need, even the air stones, all you need to buy, is the pipework and the air-pump. So far, it`s working great, but it has only been a few days. I`ve uploaded a video to show it working. The tank looks a little yellow/orange, because at the time, my full spectrum light was going into sunset mode, but you can see what you need to :) Great kit, easy to fit and great value as well, certainly worth fitting.

Some people say under gravel filters are no good but there is a reason they are still around. They work and they work well. If you don't mind paying exorbitantly high price's for replacement cartridges and media go ahead and by all the other types of filter media. The old school under gravel only needs an air pump. The filter itself has no moving parts that's why is was around so long. I have tried all the other types and decided to go back to this one. Easy to put together great quality made of durable plastic Great buy. And I probably will not need to replace it as there's no moving parts 😁

llooks good in tank and do the job great

I decided to go back to old school filtration for my aquarium and bought this for the non-planted area of my aquarium. Having been supplied with two uplift tubes, airstones etc was a bonus. Have had it working for a few months now and it is doing a good job. Although I still need to add more depth to my substrate media.

This seems to be fine and works well in my tank, bit fiddly to start with putting it together but never had any problems with it since I installed it, bottom of tank is always clear.

Received 2 tubes that were cracked but had to use it due to filter needed asap, the plates at the bottom are meant to be clipped together but can’t as the pieces that were meant to be clipped weren’t even laser cut properly to be able to.Apart from that it’s good

Thx :)

First time I've used this system, very impressed, would definitely buy again

We bought these to put in our 75 gallon tank so that our fancy goldfish had extra filtration. We already use a canister filter for them but I had an extra air pump from when I got an under gravel added on to my 55 tropical tank (because I'd accidentally ordered 2). I use this same brand in that one, as well!The price is awesome and they work amazingly. Helps keep the water oxygenated and they fit perfectly. Once you get your gravel or substrate in you don't even notice them.Also, these don't make noise: whatever noise you hear comes from your air pump, and if the air is too strong or you have a crappy pump, then yes, they're loud-but do it right, with air line adjustable knobs and a good quality pump and you'll have no problem. The lines were great and they gave plenty with the set up to get it up and running! Will be back to buy another one soon since I'm setting up a 3rd tank soon!

The best filtration method there is.I supercharge mine by fitting PVC pipe section into the bottom locking pipe (which is cheap and brittle - man up and fix that Penn-Plax) and attach a powerhead to the lift tubes. Add a bottom matten filter of 30ppi sponge foam and you have MASSIVE filtration surface.Real aquarium owners use Under Gravel Filters religiously. Stop wasting your money on replacing filters - "filters" are for surface area for beneficial bacteria to grow on that cleans your water & eats ammonia, nitrites and disease pathogens.It saddens me how people fall for the new, shiny junk that just keeps costing them time and money - these things work GREAT

Es del tamaño perfecto y con los accesorios necesarios

An under gravel is simply one of the best filters you can buy, dollar for dollar. This is because they are highly effective, simple, inexpensive, and last a long time. Here are some tips for how to use this filter correctly.1. DO NOT OVER CLEAN YOUR GRAVEL. This is the most important thing. You should not clean your gravel much at all. Yes some brown stuff will accumulate. This brown stuff is not "fish poop". It is beneficial bacteria. If you remove this beneficial bacteria your filter will stop working and your fish may die. DO NOT OVER CLEAN YOUR GRAVEL. If you must clean your gravel, only clean 1/2 the tank at a time and give the cleaned side some time to regrow its bacteria before cleaning the other side. Otherwise only very lightly clean the top 1/2 inch of gravel.2. You do not really need the carbon cartridges. If you want to support Penn-Plax, I guess you could keep buying them.3. Use 1-3 inches of 1/8 inch aquarium gravel on top of the filter. Under gravel filters are so effective because they provide a lot of surface area for beneficial bacteria to grow on. The more gravel you have the more effective this filter will be.4. Decide whether you want to use a power head or an air pump to move water through the filter. Power heads will greatly increase the effectiveness of the filter and provide cleaner water. If you plan on having a lot of fish in your tank, you should use power heads. The power heads should be rated at a gallons per hour that is 2-3x the gallons of the tank. If you use air pumps, they should be rated for the size of your aquarium.5. Decide whether you want to join the under gravel plates or not. If you are using air pumps I would not join the plates. Simply put an air stone in each uplift tube for each plate. You do not need to buy multiple air pumps. Just buy a simple 'T' joint to split the output from the pump. If you are using power heads, I would join every two plates and use one power head per two plates.Some people are complaining that this filter killed their fish which is very unfortunate. The filter did not kill their fish. Incorrect use of the filter killed their fish. They probably cleaned out all the gravel and removed all the beneficial bacteria which caused the filter to stop working. Unless the filter has become so clogged that the water is no longer flowing through it, there is no need to clean the gravel or underneath the filter. If this does happen, I would suggest that the person is greatly overfeeding their fish!Some people are complaining that this filter "produces high nitrate." Producing nitrate is the point of all filters and shows that a filter is functioning properly! If your nitrate levels are too high for you to manage, you are putting too much food in the tank. A different filter is not going to fix this. There are only two ways to remove nitrate from an aquarium: change the water or grow plants. Really the plants are just incorporating the nitrate into their bodies, so you will have to remove some plants eventually too if you want to actually remove the nitrate.There is a reason many successful hobbyist have used under gravel filters for decades and I am very glad that Penn-Plax makes this product!

This was easy to assemble and has performed very well and the price is very competitive.