I have well water here with ph of about 7.5 and it is very cold. I blasted them really hard with it with a spray nozzle for several days and it worked but I didn’t have many of them at the time worth a try tho. Good luck g
Note to self, when using t8’s you can’t run them like t5’s sizzle your babies awe crap light burn takes awhile to show up, learn the hard way that’s me.