Re Grohe single lever kitchen faucet. The hot water flow rate has reduced - the cold is normal.Have checked the supply line to the faucet and hot is normal. Problem then must be in either the flex line into the head or in the head itself. Have removed the faucet and flex line and unable to disconnect it to check there.
Can you help?

Hi GG

What model Grohe faucet do you have and approximately how old is the faucet?

Mark