BRS brand GFO is great stuff. Better than rowaphos in my opinion. It rinses a heck of a lot quicker than rowaphos that's for sure.

Not supposed to rinse rowa

Really? You just let all that dust and fines into your tank? I always rinse my media. I haven't used Rowaphos in a long time but I thought it said to rinse it in the instructions.

rowaphos
 

i run 5 gal into my waste pail when i change my media till the water clears in the reactor

That's what I've always done too. I did a little googling and apparently there are tonnes of people who don't rinse their GFO. That's news to me. I've always rinsed mine and most people I've spoken to rinse theirs. Honestly, I don't know why you wouldn't rinse it? It's quite dirty with all the loose GFO fines which just ends up in your tank. I know it's harmless and your tank will clear up but still, rinsing the gfo a simple step that can eliminate this.

They do indeed say not to rinse Rowa. I think it's because they know their product is so annoyingly fine that you'll lose half of it (and it's effectiveness) down the drain if you do.

In a reactor this does indeed make a mess in the display so I ignored those instructions back when I ran Rowa on my 97 before switching to BRS.

In a bag tho I currently don't rinse it and no fines leave the mesh bag so it's win/win.