OK, as long as you have no PHMB (Baquacil, etc.) or copper, you can clean it up with bleach.

Since you don't know your stabilizer level, you can start with 2 gallons of *plain* 6% bleach (somebody posted yesterday, having made a huge mess with the new gel Clorox!), added each evening, within 2 hours of sunset

Get a cheap OTO (turns yellow) / phenol red testkit, and test 1 hour after adding bleach and AGAIN in the morning within 2 hours of sunrise. If your chlorine is low, add another gallon. Repeat continuously till the problem is resolved.

Run your pump 24/7 till the pool has been clean and clear for 2 days.

Please get a better testkit.

Really what's needed is the Taylor K2006 or 2006C. You can use the link below to Amazon, if you like. But, only purchase if the seller is "Amato Ind" -- some sellers on Amazon and elsewhere confuse the K2005 and the K2006. Only the K2006 allows you to test high levels of chlorine.

If you can find out what your stabilizer level is, it would help a lot. If it's high, 2 gallon doses will not be enough. If it's low, higher doses could bleach your cover (or liner?). Also, comparing levels from last fall with now can tell us a lot about what sort of problem you are facing. If it was high before and 0 now, it may take a HUGE amount of chlorine to clean up.

Do NOT cover more than 2/3 of the pool while cleaning up. Byproducts of the chlorine cleaning things up can damage covers, if it doesn't escape.

Ben