I think after brushing sides and bottom and vacuuming, that you should go swimming! No need to get new sand, or filter cleaner. To keep the green away, all you have to do is keep your chlorine levels up where the "Best Guess" chart in my sig indicates they should be, and you should be green-free all summer.

Until you get CYA in your pool, you're going to lose chlorine to the sun very quickly, so you might need to add bleach 2-3 times a day just to make sure it never goes to zero, then adjust your minimum chlorine levels up as your CYA starts to rise. It's going to take a long time to raise your stabilizer just using tabs--you might want to consider adding a dose of CYA into a sock in front of your return to target about 20 ppm, then use the tabs from there. Also keep a close eye on your pH when using tabs, they will tend to make it drop, and you don't want it less than 7.0.

Janet