Adding a DIY Diatom Filter to a Canister?
As I was sleeping, I dreamt up a possible solution to this situation using my XP3 filter. Basically, use the pleated filter material that the Magnum filters use (I am pretty sure that this material can be found at a craft store to save money), and hold that in place in the filter using foam (think of very small foam in a cylindrical shape, and flexible (maybe 1/4" diameter?). Cut a notch into the foam and insert the pleated material. So basically, you are making a filter pad the size of the media canister. Place the diatom powder under the pad, so that the flow of water will push the powder against the pleated material. I am thinking of 2 or 3 layers of material to guard against wierd flow patterns and DIY lower success % factor.
I have attached 2 drawings - the first is the media set and flow pattern in an XP3. I would put the diatom stuff in the middle canister to prevent wierd flows at the top affecting the powder movement, and also because my whole top container is filled with floss.
The second drawing is of a potential set up in a container illustrating how I would place the diatom filter, the other filter media, and the flow of water. There is also a top view of the "look" of the diatom filter in the container. The Diatom powder would be placed below the pleated material media so that the water flow would "push" the powder against the pleated material.
My thought is this - my filter is rated at 350gph - Lets assume worst case, so 175gph into the filter. according to the filter diagram, some inflow will immediately pass out of the filter, assume 20% loss. If the diatom filter is only 50% successful, then based on a reverse compound interest calculation, and a randomly chosen set amount of 100ppm of algae in 75g of water, then in 7 hours there would be less than 1ppm of algae left.
I don't know if this would be a universal fix for all canisters since I am pretty sure the Fluvals have vertical compartments, but if it works, it should be applicable to the eheims...
So, any glaring flaws with this? Heck, any thoughts at all about its potential success? TIA