Shamus, It's a fairly simple operation. the most difficult part is priming the HOT. Here is how i did it. - Prepare materials: HOT w/ micron cartridge, DE, tall vase (to prime in) or any tall narrow container will work, Some flexible tubing to go from the HOT output to as close to the HOT input as you can get it. Note: it may be worthwhile to do a dry run to see if everything is going to work ahead of time :) 1) Assemble the HOT with micron cartridge and fill it as close to the top as you can without spilling water out, then seal it up 2) Devise a way to stick both the HOT input and the HOT output into the vase. I used some tubing to go from the HOT output into the vase then zip tied the input and output to each other. 3) Fill the vase with water, stick the HOT in, turn it on and then begin adding DE. I find it works best to add a bit at a time so the DE doesn't settle on the bottom. Our goal is to get all of the DE in to the HOT and to "stick" to the micron cartridge. It will be cloudy for a while until all of the DE sticks to the micron cartridge so be patient. 4) After the water inside of the vase is clear it's time to boogy! Take the HOT and vase (with the HOT still running) and then place the HOT on to the aquarium *while also placing the vase inside the aquarium*. At this point it becomes obvious that you need a priming container that will fit inside of the aquarium so make sure you pick on that will fit! The idea here is we cannot loose the HOT suction or all of the DE will fall of the cartridge. So once the HOT intake is below the waterline you can remove the vase from the setup and let the DE do its job. You should notice a difference within an hour. If you need me to or If it's something of interest to others in the club I could snap some photos of the setup I used to make it more clear. -Bryan _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member