Steve,

Here are some of the specs on sulfur ...

1.5 Liter of media will be good for up to 250 Gal of water.
1.5 Liter of media = 3.3 Lbs of media (1.5 x 2.2 = 3.3)

Looks like you have a 90 Gal + 75 Gal sump .. say you have 135 Gal total volume

135 Gal would call for approximately .81 L of media = 1.8 Lbs of media. That would allow you bring the flow through the reactor to as high as 5.4 Liter /hour (effluent) .. thats ~ 1.5-1.6 Gal /hour .. that would turn your tank's volume over every 85 hours .. every 3 1/2 days.

Hope this helps a little.

Here is my setup:

15 lbs of Media = 6.8 Liter of media.

with the media, my reactor could be rated for as much as 1,100 - 1,200 gal system.

I'm currently running 18 Liters of water through the unit .. thats about 2.6 x the flow to media ratio ... up to 5 times is quiet OK as per original experiments conducted by Marc Langouet.

BTW .. i just tested my 'trates ... ZERO on the reactor effluent, and between 0 - 2.5 on the tank. Best it's ever been.

Here is a picture of my unit ... next to it for comparison .. a 160 gal salt mix (reef crystals)

The following are my test results:

Left are TANK | Right are Effluent

first time I've got to take pictures ... in a while!

this is the reason for why you should run a PRE-FILTER to the sulfur reactor ... this one used to be WHITE .. about a month & 1/2 ago.