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If you have a septic tank, you are safer to just heave it in the yard. Some plants will grow in the pipes and make a mess. To water plants is good!! I do that myself. The rest goes in the yard!
I attach my water changer hose to the drip system I have in the back garden so I just suck it all out while it's watering the plants - I also have about 150 feet of tubing so it can stretch out the back door to the garden
My cichlid tank is by a bedroom window, so down the syphon & out the window. When I do wc on my planted tank I save some for the house plants and pur the rest down the sink.