Need MORE help with Phosphates...

Recently, I asked some questions on how to reduce phosphates.

Among the suggestions that I followed were....

Get a refugium...
I did the best I could, I have 5 different types of plants growing in the
sump of my wet/dry with a light on them 24/7. The plants have gone mad and
are growing like crazy!

Try various phosphate removers...
I Tried PhosGuard from Sea Chem
then I tried the pads from Tropical Science,
and then I tried Kent's Phosphate Sponge.

My Phosphates are still between .1 and .25 =(
Although they have gone down, they are still too high.

I've gotted the impression that phosphates and silica may be related
somehow. Just some things on the directions on some of the products that I
didnt understand entirely...
Something about, this product will remove silicates as well but all the
phosphates must be removed first.
I don't know, it almost sounds like phosphates may come frome silica as it
breaks down? -- WAG

My DSB consits mainly of Southdown but I did re use maybe 50 lbs of sand
that was included w/ my setup when I bought it (used) and it is entirely
possible it may have been silica sand. Could that be the source of my
problem?

Also, I have read a few things about DSBs and LR become saturated with
phosphates over time.
My reef is going on 9 months old. Is that enough time for this saturation
thing to take place?

Any help/advice is greatly appreciated.

~Mort