Shower Draining VERY slow

Do you own a sink plunger? Is your holding tank empty or near empty?

I would be willing to bet there is hair clogging the drain. We had one like that and work it over with a toiler plunger and it was balls of hair.

Does it have a push open / push closed drain plug. Just fixed mine tonight. Had to unscrew the drain plug and remove the hair that was built up underneath it.

Take the chrome cover off and clean the gunk out. I have had to do this a couple of times. Takes maybe 5 minutes. Kind of gross the hair and crud but things like are necessary at times.

:E

I am suspecting hair. No plunger on this trip but will get one tomorrow. If that does not work, I'll see if I can get the drain out. Thought there might be a known , not to harsh chemical fix.

I would first look for something like this "As Seen on TV" hair clog removal tools. http://www.walgreens.com/store/c/turbo-snake-drain-hair-removal-tool/ID=prod6000973-product?ext=gooHousehold_PLA_Drain_ampersand_Septic_Care_prod6000973_pla&adtype=pla&kpid=sku6000559&sst=11404bea-eaa9-7728-4af8-00007d0adbc1
If that does not help you could have a more serious clog downstream which would need a longer snake to access. It's also possible that your grey tank vent has become dislocated or clogged (check the roof).

pour some bleach down drain, haven't tried this but have been told that it works and to do it every once in a while ken

Bleach works very well for hair, I use to own a dozen or more apartments and that was a standard treatment.