Should I replace just the sprayer head or the whole thing?
This really depends on how old your sprayer is and also, where the problem is. If your sprayer is leaking where it comes out of the sink, or if there is a problem with the hose, it doesn't make sense to replace just the sprayer head. However, sometimes there is a problem just in the sprayer head. If the holes are terribly blocked with lime, you might only need to by a new head. A new head runs about a dollar.

How do I find a replacement or replacement parts?
Fortunately, the simple machine that is your sink spray features universal parts. Like buying a new sprayer for your garden hose, any number of sprayer heads will work; you just have to make sure that the sprayer head is for the right size hose. The same is true for the entire sprayer. Sizes are universal. If you have questions, you can bring the parts you want to replace to the home improvement store with you.

How can I repair my reduced flow?
If the water flow is the problem, you should remove the nozzle of the sprayer head (if it is removable) or the sprayer head itself (if it's not). If you need to remove the sprayer head, turn it over and find the small screw that holds the head on and unscrew it. Once you have the head off, determine what is blocking your flow. It is possible that there is a piece of debris inside the nozzle. If this is the case, remove it. More often, the water flow is blocked with buildup. If this is the problem, you can use a bath and tile cleaner to remove the lime and other water deposits.

How can I repair a leaky sprayer?
If you don't want to buy a new sprayer but want to fix the one you have you will need to replace the washers and o-rings to stop the leaks. There are washers and o-rings where the spray head attaches to the hose. Usually there is a plastic piece, or plate that the spray head screws onto. Unscrew the spray head and look for washers and plastic rings. If you have the hardware available, replace every removable part. The same is true for the assembly where the hose attaches to the piece at the faucet. At this attachment site, there will be a compression nut that can be removed and cleaned.

What if something happens to my hose?
Hoses are usually made of hearty materials and damage is unlikely. However, in the event that your hose is damaged, either you can spend an hour reattaching a new one to both the sprayer head and the faucet mount, or you can buy a whole new sprayer. Removing and reattaching a damaged hose will involve a lot of pieces. It might be a better idea to buy the whole new unit.