[slief]

Originally Posted by ClownsRCoo

What water height would be good for a DC200? I have a very light load for now and can't produce much skimmate at all at the moment. The manual says either 170mm or 220mm is preferred but I don't understand why they give 2 points.


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They provide a range because the ideal depth depends greatly on the load in the display as well as the pump speed. A heavier load requires less depth than a lighter load due to the fact that the more dissolved organics in the water, the higher the line where bubbles turn to foam will be since there are more proteins in the water for the bubbles to bind to. That results in more foam vs bubbles that just burst at the surface since they can't bind together to form foam. The higher the pump speed is run, the higher the water level. The manual states 20-25cm depth. In the case of a light load relative to the skimmer, you will want it at the higher end of that range so you don't need to close the wedge pipe too much. I'd suggest a pump speed of 28-30 watts and a depth of around 9". With a light load, I would aim to have the line where bubbles turn to foam about 1/4" - 1/2" above the white PVC collar where the cup attaches to the body. You will be looking for that line in the skimmers neck. Keep in mind that the skimmer will only remove the dissolved organics that are in the water to be skimmed out. If you aren't producing skimmate, it's because the amount of DOC's in the water are so low that there isn't much to produce. You can always raise the level up in the skimmer and run it wetter or run the pump speed higher if you want to have something in the cup to clean out.

Page 2 of the manual discusses the depth ranges for the Double Cones.
http://royalexclusiv.com/images/cont...enance_eng.pdf