Brightwell AquaticsXport PO4 Cubes - High-porosity Cube Filter Media for Phosphate & Silicate Removal from All Ponds & Freshwater & Marine Aquariums, 500ML (XPCubeP500)

Followed directly as stated on packaging and worked wonderfully. 10/10 recommend!

The product itself is very effective but the one I got was 50% powder due to bad shipping.

I used as directed and it brought phospates down to zero practically overnight. I have now taken some cubes out as some phosphate is required. I would suggest that you start with a smaller amount than recommended and build up slowly until you get the results you are looking for.

We will see how much difference this will add to my previously established Saltwater Reef Aquarium! I will update my review every few months. I placed this Biological Media inside the top of my AIO Built in Sump. I recommend to always place Loose Biological Aquarium Media inside of a Reusable Netted Bag so you can rinse the Biological Media Bi-Monthly and Rinse away any detritus (Wasted Food - Dead Fish - Fish Poop.) If you Establish this Biological Media with Live Bacteria by first by 1. Soaking the Biological Media in a Bowl of Liquid for 24 hours before adding to your aquarium. 2. Add and Refresh your Aquariums Live Bacteria every week by adding the set amount on the bottle (Do Not Over Use or Using two Different kinds of Bacteria at the same time as you can end up Killing all your Livestock)(Also when measuring the amount of Live Bacteria make sure to subtract out the space of your Live Rock, [Example a 55 gallon tank filled with Live Rock in a Saltwater Aquarium you probally need to measure the Live Bacteria against about only 40 gallons of water, add back into your gallons the approximate gallons of water from your sump, so a 35 gallon sump typically will only be about 10 gallons of water, so you'll be measuring in this example 45 gallons of water)] and 3. Do Bi-Monthly Maintenance by Easily Removing your Biological Media you Placed inside a Netted Bag So you can Rinse Away all the Detritus so your Media Remains Healthy and able to do its job more effectively. The Media is very dusty in packaging, So I recommending rinsing the Biological Media before Soaking in Your Fresh Live Bacteria Bath then adding to your sump or chosen filtering system.☆I sure hope people new to the Hobby will read this and Save themselves some Money by NOT OVERDOSING YOUR Aquarium with LIVE BACTERIA and also Doing a Bi-Monthly Rinse Maintenance you should have an extra Clean and Healthy Reef Aquarium!

Outstanding! Did the minimum at first for a few weeks, had a small effect. Doubled up and a few weeks later I'm exactly where I want to be with my phosphates. And no reactor...just a filter bag by my return pump. So easy to deal with!