I am a CPO! A certified pool operator! This test I took today was definitely one of the hardest things I have done in a very long time! Calculating flow rate, turnover rate, breakpoint chlorination... how many gallons you loose in a 100,000 gallon pool if
[Today’s guests]
Welcome to #trainhostelhokutosei from all over the world! We enjoy talking with them and taking photos:) The guy who is from #Sweden have traveled more than 20 countries and show us many beautiful pictures! Tokyo is getting warm nowadays!