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The faucet is rated at 6.7L/minute (<2 gal/m) and I would expect that's a design of the cartridge. You could measure flow with spray head attached, then remove head (see link) and measure again to see how much the head reduces rate of flow. You could try removing the check valve(s) but not sure if that will work as it may leak.
product features · consists of: single lever kitchen mixer · swivel range 150° · with telescopic function (330 - 500 mm) · normal and spray jet · lockable shower spray, spray returns through pressing spray diverter · quick connect shower hose · flow rate 6.7 l/min · ceramic cartridge · connection type: G ? compression · integrated non-return valve · suitable for continuous flow water heaters
Have you tried pressing down on the spray hose, turning it either way while pressure applied to spray head (pushing it down towards hose)? (like a childproof pill bottle)
Take out the plug button on the front side of the faucet handle and loosen the set screw with your Allen wrench, then pull off the handle. Remove the domed cap underneath the handle by unscrewing it.
Take off the entire spout by removing the mounting hardware under the base and lifting the spout up and off the faucet. The hose will be attached underneath the counter. Once you unscrew the connector, the spray head can be removed.
You have a piece of sediment lodged in the spray head which can be removed by dissasembling the head... could also be a bad rubber seal in the head which might require replacement.
I have the same problem. By taking off both aerators, I can see that the rubber ring inside the spray head partially disintegrated. Little pieces of rubber even fell out. I can remove the spray head (it twists off; I used a pliers and rubber gloves) but I can't take it apart and even if I did, I don't know if I could replace the rubber ring.
Dear zenith 10deg,
The outlet elbow attached to the head inside must have cracked. Leakage from selas do not that much spraying. Spraying are almost always caused by the cracking of the outlet elbow or the cracking of the head itself. The inlet elbow also makes a lot of spraying wheb broken, especialy if inlet water pressure is high. To see exactly from where the spraying is coming out, one must for sure remove the cover. Removing the cover must be done, because just the same one has to fix the problem.
Regards,
fulltech.
Start by removing the spray head from the hose. Pull the spray head out and with a channel lock pliers unthread connection between the spray head and hose. BE CAREFUL not to let the hose fall back down into the faucet. With the hose directed down toward the sink test for volume by turning on the faucet. If you get a nice volume the problem is in the spray head. This is usually the case. Put the spray head back on then remove the aerator. It's the screen where the water comes out of the spray head. Clean out the assembly ( 3-4 parts). Reassemble and test.
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