Now ya' got me worrying...
. I've got 33's from the same "supplier". Couldn't pass-up a bargain ? I've had one in use as a sump for a year and a half. I just set up two more (new) in the basement "laboratory". The sump tank has a centre cross brace (plastic frame). The new ones do not.
. All are drilled for 1" bulkheads in various locations. The sump is
not on foam...uh-oh.
Were your's drilled ? Cross braced ? Full capaciity...?