Remember when you use a pump for the phosban reacter you have to adjust the water flow on it and it should be tumbling a little bit inside the reactor.
i use the same also ......did u use the filter sponge in the reactor and did u cover the hole from the tube that take the water in , did u cover that when u poured the rowa in ?
ROWAphos is a lot finer than normal GFO. You only want very little of top to boil.
I use it, and find it more forgiving on the amount.
What size tank, and what size container.
Make sure the pump is connected to the inlet in the center. The outlet is off center. Also a sponge on the bottom and top. And a valve on the pump inlet. I used both rowaphos and the 150 with no problems.