Penn-Plax Cascade Filt-a-Pack Aquarium Canister Filter Media Bag with Bio Rings – 10 Oz – 1-Pack

Product works as you would expect. I recently got 2 turtles, and I thought I didn't need to worry about water chemistry, so I got a filter and set it up with just mechanical media, thinking I could strain out turtle poop and leftover food and be fine. Nope. I was doing 100% water changes every 4 days or so, which gets old with a 50 gallon tank. So I finally did some reading online, and realized I needed to worry about the biosphere in my tank. Since adding these rings, and the nitrate remover cubes from penn plax, as well as adding the proper starter bacteria (I used Stability by SeaChem), I have clean, clear water that doesn't smell, and goes for weeks without me having to do anything but rinse out my filter weekly.Note, if you use these, once you have your biosphere setup properly, you do NOT want to rinse them in tap water. When you clean out your filter, take these out and give them a good dunking in your tank. This will clean anything off their outside, but will leave the good bacteria happy and healthy, so that you don't have to set your tank up all over again.Note: They come in a mesh bag, but if necessary, you can cut the bag open and distribute them inside your filter however works best for you. I have left mine in the bag for ease of cleaning, but your mileage may vary.

Utilized in the Penn Plax Cascade 700 and 1200 and this product is tightly packed into the Nylon bag. The directions state the bag could be cut and emptied into the tray, which is better for equal distribution in the tray.Added this into the Cascade 700 bio-foam tray (only has two trays), removing the second polished floss pad that came installed originally, and in a bigger bag for better spread out (and flow) and distribution in the tray.In the 1200, installed but, without mesh bash, may need at least two orders to fill large tray. Mixed with small bio-balls (similar media), to top off tray.Good product at good price, can be used in any canister filter.

Helps keep my tank clear and fish happy. Would buy again and recommend.

I use these exclusively for my tank. The black carbon was destroying my fish and the tank. These keep it super clean and my fish are happy campers:)

it is a very big help with my filter

I like them.

This works well in our aquarium

I used two of these in my Cascade 700 canister filter, great value. I removed the rings from the media bag to help the media spread out and lay flat in the media tray. The media bag is high quality, I'm saving it for future use.My media arrangement, from bottom to top is: BioSponge, BioRings, BioRings, BioFloss.