Pam,
I dont think Rob has done a show regarding media reactors, so I will attempt to help you,
#1- Running
GFO (granular ferric oxide) in a media bag in the
sump may help a little, it works best by having water pushed through it.
#2- you will want to use
GFO until you get the
PO4 to near zero levels and then you may only need to run it occasionally to keep it in check. Once you get the
PO4 in check you should only have to run a small amount of media in the reactor to control it if it climbs again. When not running
GFO, you can use the reactor to run carbon.
#3- TLF Phosban reactors are fine products for the $30-$40 they cost...a good investment. Avoid the older style reactor if you can, the one that has about 12 nylon nuts that hold the top on. The newer style is much less tedious to change the media.
#4- a MJ 400 will be plenty of pump for reactor. I had a MJ 900 on mine and had it almost completely shut off to get the right flow.
