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Then, does TSP need to be rinsed?
Standard TSP must be rinsed away with clean water. Depending on how dirty the surface is, several rinses may be necessary. It isn't as strong as the original TSP, but it is well-suited for lightly soiled surfaces and general-purpose cleaning. It requires no rinsing when mixed as directed.
Just so, how do you dispose of water sealant?
Driveway sealer is considered household hazardous waste. If any sealer remains in the container, the container must be brought to an Eco-Depot household hazardous waste collection event for proper disposal. If the bucket is completely empty of sealer, it should be thrown in the trash.
TSP is moderately toxic by ingestion and is a minor skin irritant, but the big advantage of using it is that it doesn't produce toxic fumes. Keep TSP out of children's reach, and use gloves while cleaning with it.