We are first year pool owners and recently winterized the pool, but kept the connected spa open. Because the water volume is so much less, i am still trying to figure out how to keep the chemicals balanced. Today while testing with the K-2006, I needed 4 scoops of DPD Powder to turn the sample pink, at which point it turned a deep pink (not light pink like it has been in the past). After about 30 drops of Reagent (15ppm Cl), it was still deep pink and I stopped adding more. Is my problem too high of clorine, or no clorine? I have a SWCG, but still trying to figure out the right mix of pump time and SWCG time.