tub drainage problem

[frankieromance]

for the 3rd time in 1 year, the water in the tub takes forever to go down the drain. the 2 previous times i used some draino and that fixed it. but this time, the draino did nothing. i heard it's not good to keep using this product. does it sound like i have a serious clog somewhere and i should call a plumber? the pipes that run from the toilet down are pvc. does draino affect them more than copper piping?

[pgtek]

draino do harm pipe make the hot and melt some time
there some liquid plumber that work good
sound like hair buildup in the p trap
you could try to remove the inner part of the drain in the tub
inside the drain part it shape like a + insert the end of a pair of ajustable plier
between the + and twist of counter clockwize it should come off the used a plumber snake and clean it out