I started using this about six weeks ago after being lazy on water changes. My nitrates were through the roof, upwards of 80ppm. I was doing huge water changes but struggling to get them back down. So much so I got through about three months worth of salt in a few weeks.
After reading about this and seeing that one of my local stores uses it I took the plunge.
Use it as directed and it's really good. It's pricey but seems to last a good while. I've got back to normal water changes and my nitrates are around 10ppm. Algae is gradually being starved and my fish are fine.
Just gradually introduce it into the reactor as directed and use in conjunction with remediation and it works a treat.
Apparently it is obvious when you need to top up with biogen because it gradually dissolves but not needed to yet.
I was told it will take about 8 weeks to get my nitrates down and it's taken 6 for me to be at a happy level.
I'm impressed and won't be going back to rowaphos.
This is cleaner and easier and in my opinion better value for money.
Time for me to introduce the inverts I lost through my own laziness!