+ Don't need pics of water; we need test results, primarily for stabilizer.
+ But, you need to fix your water: pH between 7.2 and 7.8; chlorine above 5ppm 100% of the time!
+ 10 gallons on your pool is only 20 ppm; if you have bad algae, and high stabilizer, it may not be nearly enough.
+ When fight algae, once your chlorine goes back to zero, you are generally back at the start, and all the chlorine you've used so far is wasted. You have to MAINTAIN high chlorine, till the algae is gone, or you are just wasting your efforts and $'s.
+ Once you have your CYA level, read the Best Guess page to find appropriate chlorine levels.