DIY wavebox?

[match55]

I have been doing some research on wavemaker/wavebox, as everyone knows that they are $$$$, so I was looking around the DIY project.

the diy wavebox looks good while I have some extra pump, but!!
but... keep turning on and off the pump doesn't sound like a good way to treat it, is there anyway that I don't have to turn the pump on and off.

I am thinking to have a pump suck water into a seperated box and release it about every 2~5 sec, but with my limited knowlegde, I have no idea how can I do this.

something auto on/off one side of the box to release the water.
instead of on/off the pump.

is that doable??
and I would love some advice and suggestion on how should I do this.