My pool was green and after following the green pool instructions, it is turning light milky blue. I am trying to keep it at shock leve. However, when I test the FC level using the TF-100 Test Kit Chlorine Drop test - As soon as I add ONE heaping scoop of the R-870 powder and swirl to mix. The solution turns clear immediately without adding R-871 solution. I used the Chlorine Test (OTO) then the water turns red instead of yellow. I brought it to the pool store, it says the FC level is 5+. Is there anyting wrong with the TF-100 Chlorine Drop test? Thank you.