Blog 20: Three Column Chart

	Statement	Reason	Verification
EQ	1) What is the best way to maintain a commercial pool for public use? 2) maintain: to clean and keep the pool up to code. 3)commercial pool: typically a competition or olympic size pool averaging in 300,000 gallons in capacity or more. 4) public use: when the pool is used by 200 people or more each day.	2) There are laws and regulations requiring the proper disinfection of public pools and spas. 3) These hold much more water, being one of the biggest reasons it is a commercial pool. 4) These pools are open to the public or are used by a number much larger than a pool in a person’s home.	2) CDPH Codes and Regulations 3) David Dreivis - Mentor 4) David Dreivis - Mentor
Foundation	5) ppm: parts per million 6) alkalinity: the capacity of a solution neutralize acids. 7) pH balance: 7.4ppm to 7.6ppm 8) Water hardness: the total concentration of Calcium, Magnesium, and other minerals in the water.	5) The unit of measurement used when the water balance is measured. 6) This is meant to prevent too much acid in the pool, helping to keep the balance. 7) It is a way to measure how acidic or alkaline the water is. Typically 8) Adding the correct amount of Calcium Chloride helps to keep the water hardness balanced.	5) Definition of parts per million 6) Definition of alkalinity 7) Charlie Davis - “Everything you always wanted to know about pool care.” 8) Charlie Davis - “Everything you always wanted to know about pool care.”
Answer #1	9) The water needs to be clean. 10) Chemicals like liquid Chlorine, Sodium Bicarbonate, and Muriatic Acid are added to sanitize the water. 11) Too much of these chemicals can cause harm to humans, but too little can allow the growth of algae and bacteria. 12) Keeping the water chemically balanced is the first way to maintain the pool’s water.	9) Commercial pools are required to stay up to a code set by California. 10) These chemicals are designed to keep the water balanced and clean. 11) pH level helps  indicate the levels of all chemicals used to clean the water, making it easier to balance the water. 12) Balanced water will allow the water to stay sanitized and free from algae.	9) CDPH Codes and Regulations 10) Joe Dumont - Mentor 11) Charlie Davis - “Everything you always wanted to know about pool care.” 12) CDPH Codes and Regulations Joe Dumont - Mentor Charlie Davis - “Everything you always wanted to know about pool care.”
Answer #2	13) It is hard to keep a pool clear of debris without a filter. 14) A pool filter is a key component in pool maintenance. 15) Three types of sand filter exist: Cartridge, Sand, and Diatomaceous Earth filters. 16) Using a sand filter is the second way to maintain a pool for public use.	13) If a pool does not have a filter installed, debris can build up and cause a resistance to water flow. 14) Removes dirt, dust, and other filterable debris that settle at the bottom of the pool. 15) Each has it’s advantages over the other two, but all work to maintain clarity of the water. 16) Without the use of a filter, dirt and debris will collect in the water and will not be suitable for public use.	13) Liner World - “What is the purpose of a pool filter?” 14) Charlie Davis - “Everything you always wanted to know about pool care.” 15) Pool Patio and Beyond - “Pool Filter Guide Information” 16)  Liner World - “What is the purpose of a pool filter?” Charlie Davis - “Everything you always wanted to know about pool care.” Pool Patio and Beyond - “Pool Filter Guide Information”
Answer #3	17) Chemicals and filters don’t always keep the inner lining of the pool clean. 18) Brushing and vacuuming the inner lining of a pool is the third method used to maintain a commercial pool.	17) Sometimes a physical form of cleaning is required. 18) A good scrubbing of the walls and floor is a good way to move dirt and algae missed by the first two methods into the filters to be removed.	17) David Dreivis - Mentor 18) Joe Dumont and David Dreivis - Mentors
Best Answer	The best way to maintain a commercial pool for public use is to chemically balance the water.	If answer 1, answer 2, and answer 3 are all ways to maintain a commercial pool for public use, then the best way is by keeping the water chemically balanced.