Thanks,
my experience has been a bit ropey with stainless corroding in seawater systems, so prefer plastic nozzles although they do suffer from wear and tear (Super duplex or hasteloy simply isn't an option). If I convert the 1 nozzle per square foot to metric this is about 10 per m2,
Any experience with higher densities? say 50 to 100 per m2 (4-10 per ft2)? I'm okay to operate at a filtration rate of 25 m/h with the water quality I have available.