Well water may have caused a restriction where the diverter to the hand held attachment leaks while the water is flowing from the faucet set.
Is it a kitchen faucet or a tub faucet? if it a kitchen faucet it will be a cartridge issue, if it is a tub faucet it could be as easy as a o-ring or a separate cartridge. in any case the cartridges are usually in the main part of the handle and you usually have to take apart the faucet. i know this may sound funny but make sure you turn off the water to the faucet, you would be surprised how many people try to fix this with water on.
SOURCE: low pressure and flow on hot water side of single handle faucet
It could be one of two problems, one simple, one serious.
If you have steel pipes you may be experiencing reduced flow due to corrosion in your pipes. Reduced hot water pressure in the kitchen faucet is usually the first sign since this is the faucet that is most used in the home.
Repiping is a job for a professional. Another symptom you may need a repipe is orange colored or rusty water.
SOURCE: Greetings! My Kohler kitchen faucet
Begin by shutting off the water to the faucet. Then, on the back of the handle you will find a small button. remove it with a small knife blade and underneath you will see a 1/8" set screw. Use a 1/8" inch allen wrench to remove the set screw. You can then unscrew the bonnet and remove the diverter. Take the diverter to a hardware store or plumbing supply to purchase the appropriate repair kit. goodluck.
SOURCE: No water passes from faucet to hand sprayer
try soaking it in some CLR calcium lime and rust remover .
SOURCE: Trying to fix leak on kohler fairfax kitchen
You need to remove handle and cartridge and spout should come off to replace the rest very common leak
SOURCE: kitchen sprayer/diverter
http://www.pricepfister.com/www/ImageAssets/mirror/model/kitchen/marielle/mar026-4n/26548-0500.pdf
Page 2 on this web site has the diverter listed. Sounds like the diverter is sticking or hanging up and not working right. The link below has information on the faucet you have so I hope this will be helpful for you.
First you could take it off and clean it and check it out for any blockage.
http://www.pricepfister.com/product_catalog/document_search_results.aspx?doctype=15&room=kitchen&collection=Marielle
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More specific, the diverter is a "pull" method instead of a "turn" method to make water flow in to the handheld device. I will attempt to pull the stem out, back flush and replace O rings or whatever seals may be corrupted. What type of tool do I need to remove the stem?
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