evad370

New to the forum, i haven't really had any issues with my tub in the last 4 years until now.. ive had to drain and refile twice in the last 2 months..we use it 2 or 3 times a week..so i Just refiled my 5 person 300 gallon hot tub again..this time i got test strips to see what was going on.. heard about starting a bromine bank so i put in a 2 oz bromine bank starter pack and i also found i had 2 or 3oz of powder bromine i put that in as well but i still get no bromine reading on my test strips..what gives?