A slow drain can be caused by a buildup of grease and food particles in the pipes. To solve this problem, it's recommended to clean the sink and faucet regularly, and consider using a drain screen or filter.
Over-tightening of kitchen faucet aerators can also cause issues with water flow. Solution: Loosen the aerator by turning off the faucet and then turn it back on. Repeat this process until you find the aerator that's not working properly.
If your toilet is leaking, check if the flapper or chain is not sealing correctly. To solve this problem, try adjusting the flapper or replacing the old one with a new one. You can also consider installing a low-flow toilet seat to reduce water usage.
Learn more about common kitchen plumbing problems and their solutions at Testrific