I have an 18 x 48 above ground Coleman vinyl pool, first time pool owner. We have well water. My alkalinity levels after initial fill and 6 way test strips indicated highs and lows. So, I took a sample to my local pool store, Leslies....these are the results...the first test shows 30% in range, I followed the treatment instructions and the 2nd test shows 60% in range....I am assuming this is the correct path to balanced water and just curious why dry acid over liquid acid?