i now use reef scientific which im really happy with its good value doesnt take loads of running off like rowaphos and need very little flow in a reactor, it doesnt like to be knocked about unlike rowaphos so would be ideal in a bag in the sump but like all phosphate removers it works best in a fluidised reactor.
rowaphos and reef scientific are the only two i use but there are loads of diferent brands some of which people rate highly so i think its really personal choice,
Are you going to use a reactor? or just place the media in a bag in an area of high flow?
to be honest, i'm not sure where i'd put it as i have a red sea max 130d, i could put it in a bag next to the carbon media which is below the pumps but i was also considering a fluid?
red sea produce
RED SEA NO3 - PO4 -
XNO3:PO4-X will prevent the growth of nuisance algae and promote coral coloration. N:P-X is a fully researched and tested biochemical product containing a mineral complex and special blend of carbon sources to ensure the long term stability of the treatment as well as inhibiting sulphate reducing bacteria.