Corrected Q: Bathtub drain slow; snake stops at J-bend under floor.
Glued plastic drain pipe is accessible in unfinished basement ceiling of 2008 home I own. Want to manually unclog every year, like basin & sink easy, without costly Drano which doesn't work well. 1/4" manual snake down thru overflow, stops at J-bend. Do I pay a plumber to customize plumbing?