Aquatic Experts Bio Balls Filter Media Bulk, 1.5 Inch Large Bio Balls for Pond & Aquarium Filters, Pond Filter Media for Outdoor Ponds, (300 Count with 14" x 20" Mesh Bag, 1.5 Inch)

It's a big bag. Great for adding surface area for bacteria. Placed the bag in my Biosteps filter, hopefully helps prevent crashes. Great quality. Better than the cheap Chinese stuff. Initially thought it was expensive but now I think you get what you pay for. Worth it

Very effective, and easy to clean

EASE OF CLEANING GREAT PRICE AND QUALITY

So far so good. I am very pleased with this system. it is working very well with no complications. I am using it in a 300 gal pond it's just great.

Do the job!

I have been using fiber filters, but they breakdown too quick. The Balls were very inexpensive, and easy to install. The balls have trapped so much algae breakdown. Balls are easy to clean, we have a bucket with holes drill in bottom, pour balls in bucket and just blast them clean. Balls should last a very long time? All around money saver for my pond maintenance. Once new balls have been installed, I have notice pond water stays cleaner for a longer period of time. I would recommend this item for your pond water cleaning.

Good value

I have a similar product that came with the filter & wanted a backup. The original product is a larger bag with a draw string. This one is a smaller bag with a zipper. It doesn't actually fit in the filter as well a it should. Disappointing.