I'm really surprised. Walmart's inventory control systems are supposedly state-of-the-art.

Regardless: absent any water problems chlorine levels should be about 5% of your CYA level. CYA levels should be at least 30 ppm, to maintain chlorination throughout the day. CYA levels are DETERMINATIVE of chlorine chemistry, which is why it's so important to have decently accurate CYA readings (= NOT strips)