Skilter 250, Modified
:laugh:
Well, I got it, modified it, and it's doing it's job fine! Pulls a lot of brown stuff out of my 10 gallon, and hangs on the back without occupying space. It cost $29.00 and all the mods were free, as they were done with odds and ends I had around.
Had some trouble with adjustment and overflows, but installed a big overflow line back into the sump and that should solve the problem while I get the knack of controlling it.
I performed two mods on the Skilter 250:
1) Drilled a hole through the bottom of a 35mm film cannister, inserted a 2" ashwood air block's stem through the hole and ran airline tubing from this assembly (which I placed at the bottom of the skimmer chimney) through one of the openings in the bottom of the skimmer to the sump, and out to a tee with a release valve on the open stem, then to an airpump with volume control valve. This setup allows me to adjust volume and pressure of the air to the skimmer. The film cannister blocks most bubbles from escaping into the sump through the bottom openings, and keeps the tank bubble-free, The airstone doas not make noise like the stock venturi valve does (and that makes an awful racket!).
2) At first I drilled a small hole at the top of the overflow tray side over the return weir and inserted an airline "tee" with the open end pointing up as a vent, and airline tubing to the sump. This was to act as an overflow return. I discovered quickly, after my first overflow from bad adjustment, that airline tubing is too small in diameter to keep up with an out of control skimmer reaction (China Syndrome?!). I drilled a 1/2" hole, added a PVC fitting and some 1/2" pond tubing I had in my shop. This should work, and solve the small overflow tray problem.
The left side showing the film cannister/airblock inside the working skimmer, and the air supply line routing and air bleed valve.
The top showing the large overflow drain dumping back into the sump.
The skimmate tends to be on the wet side, although on ocassion I have set it exactly right for very dry froth. With more practice I will find the "sweet spot" more reliably. I can run it all day and night long, emptying the tray every night (the overflow is for emergencies only - don't want my little 10 gallon tank to empty itself). It has made anoticeable good in my water quality.