For now, test a couple times a day and each time add enough bleach to get back to 5ppm. When you add the stabilizer tonight, I wouldn't aim for 50. Aim for 30 for now. That will give you a little room for it to increase when you need to use trichlor - like this weekend. You might want to take the cl up to 8 Saturday morning or Friday night if you are leaving too early to mess with it Saturday. That should probably make it work out fine for this weekend. Hope this helps.