I must be the luckiest son of a gun in the whole world, seriously, a typical water change for me; 1) remove 20-25 gal from my 55 gal tank
2) mix 4-5 5 gal buckets of new water from my super duper carbon filter gizmo at the sink, make sure it's close to 78 degrees (close) and as soon as the salt is melted, add to tank.
now i do have some algae in the tank but that could be from the lack of a uv bulb in my uv filter, or the fact that my lights are probably 2 yrs old. i've been doing water changes this way for 6 yrs and never have lost a fish anytime after a water change, same day, next day, next week, next 2 weeks to my memory, not lost and corals after a water change, most of the time everything looks more happy the next day. caustic? i don't know if my experience concludes caustic. one thing i will admit is that all of you know more than me about this stuff, but if it is so caustic, how do i get away with a 50 percent water change the way i do it without killin anything?
again i'm sure you all are right about this and don't want to be a jerk or say it's not true, but........................how do i get away with it?