Is it OK to use water from the dehumidifier bucket for my houseplants?
The owner’s manual for a dehumidifier says that the water is not safe for drinking, but the manual should, perhaps, include that it is a very good source of water for our houseplants. Rainwater and water from melted snow are usually our best water sources for all of our plants. The water that seems to magically appear in the bucket of the dehumidifier comes from the air—just like the rain and the snow. Sometimes it even goes through a filter before raining into the bucket. Tap water can be very hard, very soft or highly chlorinated, and when used on houseplants can cause a salt buildup that shows up as a white crust on the soil or sides of the pot. Too much salt can change the pH of the soil. Ideally, water should have a neutral pH, be room temperature and, if from the tap, be allowed to sit overnight so that chlorine can dissipate. If you are concerned that the dehumidifier water has accumulated mildew, mold or dirt while sitting in the collection bucket, clean the bucket occasionally with a 1:1 water and white vinegar solution to prevent contaminants from being transferred to your potting soil.