CerMedia MarinePure 1.5-Inch Sphere Bio-Filter Media for Marine and Freshwater Aquariums, 2-Quart

They dont sell a big enough pack, i would have to buy 20 packs to get the amount i need. But the product works good.

Purchased multiple large bricks and smaller ones for my reef refugium. After 2-3-6 months started to crumble disintegrate to mush = large cleanup. Nitrate and phosphate high Went back to live rock and all good re water chemistry.

Awesome product fish are super happy!

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Put these in my nano tanks reservoir and noticed an increase ability for my tank to convert ammonia within a few days. Clearly works to provide more surface for bacteria as advertised. Really impressed though i wish they were a bit cheaper.

I bought this based on a video touting the benefits of this product - said its like added more live rock to your tank. A few months later my nitrates started going through the roof! Ive removed them and now the numbers are slowly returning to normal.

There are many levels of active bio media. Just like socks they come in all sizes, materials, thread count, thickness and etc. What I mean is some aquariums can do just fine with average performance bio media while others need above average performance for their sensitive fish and heavy stock tank. I fit in the later. I wish to avoid all the my stuff works better than your stuff and just state a couple of facts. 1. MarinePure is the only manufacturer that provided scientific proof of their claims when I did research on 5 major brand name products which I choose to accept as valid. 2. MarinePure is one of few products that offer rock shape items and undergravel 1 inch block. Why because this product can replace live rock IMO if you seed the bacteria properly for salt water. I have used this product in salt water and in fresh water and it is nothing short of amazing, reliable and predictable IMO. I have used it with Seachem Stability and could not ask for better results. In salt water I just laid them in the sump and in fresh water I placed them in the trays of canister external filter but being somewhat large I filled in small spaces with EHEIM Substrat Pro for maximum volume in the canister. I have used Seachem Matrix, Fluval Biomax, live rock and etc. This is my go to first choice now every time, Its performance has proven its value to me.

Excellent - in use in an HOB refugium.

Very good product

Great product and a great price