Make sure you only use biodegradable laundry detergent labeled for greywater use. Also, there are a few more rules for using greywater so be sure to read those at the end of this instructable.
Step 1: Laundry Greywater Parts
5/8 inch spade drill bit
Garden Hose Adapter 3/4 " MH X 1/2" MIP- part is in the faucet section of Home Depot, not in the garden hose or irrigation area. (Watts brand A-663 GH3) http://www.watts.com/pro/_productsFull.asp?catId=68&parCat=2680&pid=6508&ref=2
'Faucet Rosette Washer and Nut (1/2" IPS) - Danco brand
3/4" diameter garden hose
Trash can (I think mine is 20 gall, but use a larger one)
Step 2: Cut Hole, Insert Garden Hose Adapter
Cut a hole in the bottom of the trash can using a 5/8 inch spade drill bit (I had to shave off extra to make the adapter fit)
Screw in the garden hose adapter (make sure the hose fitting side is on the outside of the trash can).
Step 3: Attach Washer/Nut
Secure adapter into hole with a Danco brand Faucet Rosette Washer and Nut (1/2" IPS) on the inside of the trash can. (I have not sealed it with any silicone, but I have no leaks).
Step 4: Attach 3/4 inch Garden Hose
Attach a 3/4" diameter garden hose (this is the largest size diameter hose sold at Home Depot- most hoses are 5/8") to the end coming out of the trash can. I actually have 2 x 50 feet garden hoses (100 ft long total) connected end to end so that I can water at the far end of my backyard. Just place the end of the garden hose wherever you want to water. I move mine around as needed, but be sure you have no kinks or obstructions.
Step 5: Catch It!
Step 6: Let it flow!
RULES FOR GREYWATER:
1. Use only detergent labeled for greywater use (most grocery/market stores sell it now).
2. Never spray greywater, it has to be applied directly to the soil. Do not use it to water vegetables. It is ok to water fruit trees, ornamental plants, trees shrubs if applied to the soil (best if applied under a layer of mulch).
3. Never let greywater go down the storm drain. Make sure you water away from where it could ever overflow out of your yard in to the storm drain.
4. Do not water lawns with greywater. Do not use greywater where people will come in contact with it.
5. Make sure trash can is elevated on a cooler or cinder blocks to allow for good flow.
6.Check for kinks/obstructions in the hose line (could cause backup).
7. If you need to use bleach or non-greywater detergents, be sure you move the line to go back down the sewer drain.