Marineland Bio-Filter Balls, 90 Count, Support Biological Aquarium Filtration, Rite-Size S, T and X, Fit All C-Series and Magniflow Canister Filters

I have used these for years in aquariums and my goldfish pond to give bacteria somewhere to grow. These are sized just right to fit ten or so behind the filter pad and the rear of my hang on filter. I like to do this because it encourages bacteria to grow on the balls rather than the pads that get replaced. When the pads are changed these help carry the bio load. They also help out in the event of an undetected dead snail or fish that spikes the ammonia. I view these as an insurance policy because the more places bacteria lives and can multiply if needed the better. These really shine in a cannister filter. Fill a basket with these and you are set. I like that these allow water flow and will allow most waste through to get caught in the filter pad. There are a ton of choices for filter media available but for the price and quality I have found these hard to beat. One box is a lifetime supply and I highly recommend.

I received these bio balls in the mail yesterday,and they are small but perfect for bio filtration. I purchased these for a large hob filter to have extra space for useful bacteria to have more area. They are good quality for the price . Easy to use. I rinsed with hot water and put them in. I will update at the performance asap. Time will tell as to how long they last.

We have an outdoor goldfish pond that gets pretty rank in the Summer. These little balls cleaned up the algae in only a few days. Totally worth it!

Know what you are buying and it’s a perfect fit. High quality products from a quality company!!!

This is my first time buying marina bioballs, so this is a general review of this model bioball. Size: Average black sperical black bioballs are about 26mm these are 19.5mm, 225 standard bioballs equals 1 gallon you'd need 300 of these to fill 1 gallon. Generic mini bioballs from china (the ones that go for 20/$1) are 15mm so these marina bioballs are somewhere between standard and mini bioballs in size. Design: From what Ive seen, bio balls either have fins going in multiple directions, or made of bunch of small thin tubes, or are full spheres and are hallow and have a small sponge inside. These are full spheres but the fins are all the same direction and all go in one direction, Id assumed they have a sponge base on the photo, but the do not so in general they have less filtration capacity than the other 3 styles but are easier to clean. Even though size and design are not optimal these are still a good buy since the price is so low as long as you have the space the filtration capacity per $1 is still above average. The mini generic mini bioballs with the sponge in the middle are better, BUT will get clogged faster, need to be cleaned every 6-12mo, these can probably go 2 years without cleaning. p.s. the box says 90-Count, I got 91. So thats a plus =)

I have a multi stage canister filter for my 125 gallon tank. These things work wonders in keeping my tank clean. A quick rinse every so often when I pull the filter off and they are good to go. They work so well, I started using them in my small outdoor pond (40 Gallon or so) and they helped keep my pond clear all summer in a homemade bucket filter.

Great value. Works well. Easy to use. Helps with algae.

I’m no expert at this and it’s always a learning process but these balls have changed the game for me. The water stays clearer and the smell is like pretty much gone. It’s been a struggle trying to find the right equipment to tend to these messy turtles but I can say these balls help a lot right now and until I can afford a canister water filter this is a great purchase.

Great product

Nice product to generate beneficial bacteria

Found them to not work as well as others but no serious complaints

Las uso para un filtro canister, son recomendables para filtración fisica y biologica, les recomiendo usar arriba de estas biobolas, canutillos de ceramica

Works as described