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The clear sight glasses can be purchased at your local swimming pool supply store. They are made by Hayward. Also, you can check on line at fancykoioutlet.com. Lem makes his own and they have unions on both ends for the same price as the Haywards which don't have unions.
Moi
I take it you live in the Bay Area. You could go to Fancy Koi and pick them up yourself. Best investment you'll make for your bead filter discharge.
Nancy
My Ultima was installed with the idea of mechanical use also. I have another system which has a vortex to bio. The Ultima picks up skimmer/bottom drain water via pump, back to the jets. The bio picks up mid-level water -filters-waterfall - pond. I do believe I get quite a bit of bio out of the Ultima however I don't rely on it for that. It's kinda a bonus.
Mike
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