i have not tried rowa phos....so i can't comment.
right now, i'm using grotech GFO...although, algae growth has been retard...but diatoms still appears in my tank as these r bacteria, not algae.
i did not wash...i placed about 10+ teaspoon inside a filter bag inside my IOS...and smoke comes out when it touches water...and u can hear the sizzling sound
another plus point abt using GFO is that, it does not affect yr livestocks including sps even if the dust are floating around in yr tank....
but when comes to organic phosphates, i'm using Grotech Reef Clear...and i got a leftover bottle of zeozym ...so going to try this formula to see how effective this is....
btw, i do not test my water parameters ...pls do not try this at home