I have a older house and I cannot get the bath tub to completely uncloged. I think the P trap needs to be changed. The only problem is it is a cast iron screw togeather p trap and the tub sits on a slab so there isn’t any way to get under the tub. I think it is going to be a very difficult job to replace the cast iron P trap with a ABS one, because of the lack of room to work with. I was wondering if you know of a easyer way to replace the P trap
Try taking the overflow cover off and putting a rag in the overflow and fill the tub with water and plunge it with a plunger..Make sure the rag is tight enough so that water doesn’t come out of the overflow.Might have to have someone hold it while you plunge.I usually use a sponge in the overflow.