How to stop this leak

Recently found a pool of water under my sink at traced it back to this water purifier filter thing that is unused. The other end connects to the water valve and looks like more of a pain to deal with than this end. I was thinking of just clamping the plastic hose maybe.

Remove Faucet Handles

Anyone know how to remove these Allen + Roth faucet handles for cleaning/replacement? User manual says to remove them, but does not state how. I’m stumped.

Thanks in advance

Anyone know what catridge this shower system uses?

Maintenance?

Howdy, I have a saniplus toilet, not sure how old, was installed in the basement before purchasing the house. I was just wondering if there's any kind of maintenance that needs to be done or if it's just a flush till it don't flush no more?

Is this black corrosion causing my gas valve to stick?

Leaking hydrant

I've found it dribbling on and off all summer. It has started gushing around the main shaft too. It's only a few feet from the meter and shutoff. Do I take pipe wrenches and spin the head off or dig up the entire hydrant? What's the procedure? There is no identifying maker. Do they make a universal hydrant rebuild with new o-rings etc.?

How serious of a problem do I have with water heater pipe. And what is needed to fix

Botched boiler job

Hi all! I am very proud to be a part of the plumbing community on reddit as it's helping me with my current apprenticeship so much! I had a look at some work a plumber had done as we had a leaking PRV discharging from outside the property. Apparently the plumber fixed the leak (leak is still continuing) and upon my inspection I saw the copper to plastic coupling on the flow pipe that has been attached and most dangerously the earthing wire has been cut and not fixed to the flow pipe. I found out there was a charge of nearly £300 for this work that to me isn't safe, poor workmanship as well as having the initial issue still ongoing. What do you all think? Are my suspicions right?

Can I/How would you put a utility sink here for homebrewery cleaning? Could we tie into the laundry drain coming from upstairs and add a vent to above the trap? Not going to DIY just curious about the scope of the job before getting quotes.

Black dots in overflow hole

Came home from holiday to find this in the sink we installed 2 months ago. Unsure what it is. For what it's worth we have a water softener system in the house? Help please identifying it!

Toilet Crack -Monitor or Replace

Think this crack has been here about a year, maybe longer. It spans from where you can see her down into the inside of the lip, but not the exterior or interior walls of the bowl. I've read some horror stories on here recently regarding cracked porcelain, so now I'm leaning towards replacing the bowl. Just wondering if this would be an over-reaction on my part.