ive never really had to use an air ionizer but i do have 2 250 gal ridged plastic indoor\outdoor ponds set-up inside my gh

the water gets pumped into a water ionizer n recirulated between the 2 small ponds the ponds water is filtered before it is pumped out into self-made hydo set-up

is ionized water safe ive not any problems with it yet

it work by passing the water through an enclosed area with an uv light this water purifier kills algee found in water n grown by sunlight the koi n goldfish seem to enjoy being in clear warm water n so far my plants i havent had any problems