A bad smell in your water may be pretty indicative that there is something wrong, but it is not always easy to tell what contaminants exist unless you do a proper water test. It can also help you figure out whether you have hard water, which untreated may cause build-up in your appliances and make them less efficient.

This is distrubing.

Whenever we do a show on a botched basement or an unfinished kitchen, we get hundreds of e-mails from people who had the same problem, and they all say the same thing: "I thought I was alone".
That's part of the idea behind the TV show-to show them they're not. That's the message I give to people when I speak to a crowd. And as you start to think about renovating, that's the first thing you need to know: You are not alone. I'm here to help you.
I have tons of resources on my website for you.

https://makeitright.ca/holmes-advice/

I hired a local company to clean the algae off my interlocking stones. When the lockdown first happened, the grandkids loved hanging out by the pool.
This company brought in specialized equipment (no chemicals, just steam and hot water) and cleaned my property 👍 So happy with the results. Pressure washing took me way too long.
Company is called H2Go Mobile.