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Check out the nozzle screen for clogging. And if that does not do it then the cartridge inside your faucet is not operating properly. And those cartridges can usually be replaced. If faucet is a Moen it has a lifetime warranty and all you do is call them and they send to your home a brand new replacement cartridge. Do U have a Moen?
Take it loose from the faucet and flip the lever down on the filter in the on position. Take the cap off and remove the filter. Blow hard through it. You should hear a whirling noise of a gear, like a windmill. If not, I use a water dental pic to pulsate into it and clean it out. This is what makes the light work and when flow goes down, the light changes color. It's all mechanical. No battery. Just free up the gear so it turns freely to work the light. If standing in front of a mirror, you can actually see the light come on. PUR doesn't tell you this because they want you to purchase another one.
Since you weren't very specific where it leaks or when it started (like after a filter change) it could be tough to troubleshoot this leak.
If it is leaking at the faucet connection try tightening up where it screws onto the faucet. Depending on your strength (or lack of) you may need to use pliers to get a tight connection. Don't go crazy tight or it will crack the plastic fitting. If it still leaks remove the unit from the faucet and check the rubber washer inside where it screws onto the faucet. Make sure it's still there and is centered inside the cup and seated properly. Then reattach the unit to the faucet and tighten it well.
If it's leaking from the main body try removing the filter and reinstalling it making sure you have seated the filter properly and screwed on the cover correctly, and all the way. When it is tight the water outlet will be exactly at the bottom of the unit. Sometimes it's tricky getting it tight enough especially with wet hands.
Finally, if the leak is coming from the filter on/off selector this could be tough to fix. I would try firmly pushing and pulling the selector knob in and out several times while in both the on and off positions. This may re-seat the leaking seal. I wouldn't be too hopeful about this fix though. You may need to replace the unit if this part is leaking.