svs-30 with mag 12 on 90gallon. took less than a week to produce skimmate. still need my heater to maintain temp at 75 ish degrees Fahrenheit.
it is now in a steady 9 inches of water, i emailed jeff and he said no problems. its the same as closing the gate valve. no need to worry about a "t" for a siphon break either because it was in sump. siphon maybe a problem if my skimmer was drastically above my sump.
this is the last skimmer i will ever buy. i just stuck my arm into my tank and adjusted a power head. it never stopped foaming. it may have decreased but never stopped.
i am absolutely satisfied with this choice. i hope that when he retires some one is there to follow in his footsteps and continue his designs and product support and devotion to both customer and curious looker alike. this may be "old school" technology but it works so much better and more stable than anything i have owned.
like said before by another member, blah blah air draw, blah blah heat, blah blah watts. never been happier with a skimmer.