DT's IS live phyto (Unless it's gone bad)... The home brew stuff is the same stuff, only DT's is a blend of 3 (I think it's three) different kinds of live microalgae and is many times more concentrated than the home grown stuff is...
(The home grown stuff is generally just 1 species of micro algae)...
If you're seeing an algae bloom after dosing phyto (homegrown or store bought) then IMHO you're dosing too much, just need to cut back on the dosing amount...