Though it may difficult to unclog a shower drain with a plunger, it's worth a try. If that doesn't work, maneuver a snake down the drain opening into the trap. As a last resort, you can use a garden hose.
 Attach the hose to an outdoor faucet or to an indoor faucet with a threaded adapter.
 Push the hose deep into the drain and pack rags into the opening.
 Turning the water on in short, hard bursts should open the drain..
CAUTION: Never leave a hose in any drain: a sudden drop in water pressure could siphon sewage back into the fresh water supply.
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