Showers to Flowers

Here’s the truth, I’m lazy. So when it comes to the aforementioned greywater strategies such as bucket flushing and siphoning, while we might try them for a while we’ll most likely quickly tire of all the repetitive effort barring some apocalyptic water shortage. SurviveLA agrees with Art Ludwig, author of Create an Oasis with Greywater that the best greywater systems are the simplest, and involve the least amount of effort and maintenance.

One of the easiest and more permanent greywater solutions is simply rerouting your shower straight out a pipe and into the garden. Here’s how to do it:

1. Confirm that your shower is higher than the point you are watering. The minimum fall for waste pipes is 1/4 inch per foot — any less and you’ll risk a backup.

2. Cut the waste line from your shower, making sure that you are cutting the pipe before the point it meets up with anything coming out of the toilet. Remember you don’t want blackwater in your garden. If possible (i.e. if easily accessible via a trap door or some other configuration), install a three way diverter valve like the one pictured above, so that water can be shifted back to the sewer, if needed, such as during a long rainy period. Keeping the minimum fall rate in mind, run the pipe out to where you want to water.

3. Choose plants whose watering requirements match the amount of water coming out of your shower. To do this you’ll need to estimate how many showers and how much water you use per shower. Odds are it will be water hungry plants such as banana trees.

4. Create a mulch basin around the plants you are watering. The mulch could be gravel, wood chips or leaves. The mulch basin has multiple purposes – it slows the flow of greywater, preventing runoff and it stops greywater from forming stinky pools. Mulch also prevents contact by kids and pets and helps keep down the mosquito population.

5. Some precautions – put a screen over the end of the pipe to prevent rats and other critters from climbing up the pipe and surprising you in the shower. Keep the destination of the pipe well away from your house’s foundation, especially if you have clay soil.

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