''Why would that matter at all? The height of the standpipe will determine level in tank not the holes. The holes will determine only the minimum level in the tank.''
the out flow is a syphon, it height does not determine out box level.just its flow rate
much more out flow the syphon breaks because the level in box drops and air gets sucked in and or great more noise, any less flow and the levels become even with tank making it just a filter intake not a overflow
there is not enough play between tank level and sypon level to adjust well
Last edited by willknowitall; 10-30-2012 at 08:44 AM.