there may be a grain of sand or grit stopping flow. if you can unscrew the aerator, you can look there.

um. what is an aerator? lol, off to google. thanks davidro!

The place where water comes out (a round thingie) has a screen in it which causes the water stream to mix with room air. This mixing with air is "aeration" and the screen that causes aeration is "an aerator". It's really simple.

You can email Blanco about this flow reduction too, and you can mention that you looked behind the aerator.

There could be some grit inside another part. The cartridge mixes water.

ok, thank you, I googled, wikipedia came through. I'll check it out. Curious, how would that happen? I mean I've only had this in for like two weeks and have never had a problem like this with my old cheapo crappy faucet. If I check the aerator and it doesn't help, I'll email Blanco for sure. I'm so bummed! Hope that's all it is.

i hope the instructions say to "flush the lines." It's normal when you remove an olde faucet for grit to fall into the pipes. (For you a DIY first timer, it is not obvious what flushing the supply lines would mean and how to do it.... and this kind of service call is what pays for the plumber's vacations.)

fml. so he actually had to snake our pipes because they were draining super slowly. Could that have had an effect? He did that the same day as he installed the faucet, does it sound like this would still be the case? Argh I hope this isn't going to be an expensive issue!

possible worst case: new cartridge from Blanco.

Post once you look at the aerator.

aerator was fine. will be getting in touch with blanco today.

once you find the product PDF, you can print it out and get to know what parts go where.
After a few days or weeks, it all seems normal.
Parts diagrams.

When you discover something for the first time ever, it is normal to have those emotions you have. Normal, for many people. You will get over it. Later, you will just know it.

lol! thanks for all your help!

SummerSucks, because it's at least six years now that you submitted your original post, I wonder if you have any comments you can make about the Blanco Alta. We're thinking of getting that faucet now, and wonder if you've had any problems with it.

Thanks,

-Ken

It's the check valve on the spray hose. Clean it out. Mine had black particles stuck in the gears. It comes apart, just remember how you took it apart.

Cheers

Ronald, (or anyone) Is the check valve in the large hose at the end where it connects back to small hose from the cartridge? I have tested/replaced everything else.

This forum was extremely helpful. I have a Blanco Purus kitchen faucet from 2017, should have 2.2GPM always very nice flow but recently running at 50-75%. Simply by using the side spray must have released some debris as I'm back to full flow! We never use that hand-held but it looks cool.