nope... close, but they are not a beckett injector skimmer...
the propietary injector on the etss is much simpler than that,
it just decreases the water inlet size down to like 1/2-3/8" and then
the pressure sucks in air from the "venturi"...
which does work better if you put a small 1/2 valve on it to adjust the air back a bit.
also, the best way to clean the bio balls is in vinegar/hot water or muratic acid.
and if you can find those lee's diamond shaped bio balls they really do work better.
as for an exact pump, your just looking for about 1000gph...
maybe a 1200gph pump with a valve on the outlet to control it would be best,
this would give you the ability to over drive the injector nicely, and throttle it back slightly to
"the sweet spot". I dont know what etss was thinking when they made pump recommendations for their skimmers...
i think they were just trying to use pumps that consumed less power, because everybody knows they work better with
larger than recommended pumps...same with aqua C injector skimmers.