Since I forgot my snorkel and face mask, [:-party] I'm am going to try and determine from the pic if that is a 1/3 Hp or 1/2 Hp pump there between the floaters. A typical 1/3 hp grinder pump can blow 45 gpm for a head of 5 feet. The sewer line is maybe 20 feet up, maybe 25 depending where they buried the line. If it is a 1/2 hp it can pump 67 gallons/min for 5 foot head, xx gpm up to 30 feet. If the tank is 22" diam X 30" in height, how many gallons? Vol = Pie R square x Ht = (11 x 11 )x 3.14 x 30 = ? cubic " = ? gallons? Too slow, I got it - 47 US gallons. 39 Canadian. Less than a minute to empty that sump, because the float trips it at the half-full point, so maybe 30 gallons between cycles. I wish now I had found a piece of wire and pulled up on the float. But we had structure to look at, so now I'm trying to confirm if 4 toilets and four tub/showers, one DW and one clothes washer will fill that tub how fast. I see for a head of 20 feet, Gal/min drops to 10 gals for a 1/2 hp.