VIVOSUN Air Pump 1110 GPH 8 Outlet 50W 70L/min Commercial Air Pump for Aquarium and Hydroponic Systems (50 W) https://www.amazon.com/dp/B071GN46SJ/ref=cm_sw_r_other_apa_i_6J7HEbV6DHHGJ

Pawfly Micro Bubble Air Diffuser 4 Inch Air Stone Disc with Control Valve for Hydroponics Aquarium Fish Tank Air Pump https://www.amazon.com/dp/B07MMSYS1W/ref=cm_sw_r_other_apa_i_gM7HEb1WAH2QJ

The air pumps have lasted me for years, and the diaphragm can be replaced.

Even expensive and quiet aquarium pumps are nowhere near the lpm/gph of the one linked above. My laser-cutter's air pump is a 1100 gph one which translates to 70 lpm.

The top-of-the-line, and far quieter, Whisper-300 from Tetra produces about 10 lpm, I have 4 of them on my 600-gallon aquarium... I tried several air-pumps before choosing the Tetra for its quietness (the laser is in the garage, I don't care about the noise. The aquarium is in the living-room wall. I do care about noise there :)

Now, whether you need more than a Whisper-300 can deliver, I don't know. My limited understanding is that the better the air delivery, the better you can do deep cuts, up until the air-delivery is producing a detrimental cooling effect. That's why I went big, and put a valve on it to adjust the pressure.

At the moment, I'm letting the air go full-blast. I'll start characterising the laser when my macken-knock-off power-meter arrives and part of that is going to be air-assist effects.