Filters, filter sizing, and advanced circulation

Question 1

How is proper circulation vital to the health of swimming pool water?

Answer 1

It ensures proper turnover, removes turbidity, and lessens chance of dead spots

Question 2

What are 3 basic functions of circulation.

Answer 2

From outlets water is filtered, heated, treated, and returned through inlets.

Question 3

What is most important component of a pool circulation system and must run continously

Answer 3

Centrifugal pump

Question 4

When filter system is located below the pool basin, where is the pump located and what is its function

Answer 4

Centrifugal pump is after the filter and pumps water up into pool to be gravity fed through the filters

Question 5

When filter system is at or above the pool basin, where is the pump located and what is its function.

Question 6

What is the two most common pool situations for causing gaseous cavitation?

Answer 6

Loose seals and cracked fittings

Question 7

Your hot tub has a 1/2 hr turnover and has a volume of 80,000L. Will a high-rate sand filter 2.5 m in diameter be adequately filter that water? Please your work.

Answer 7

Calculate flow rate
80,000 / 1800 = 44.44
Calculate surface area
3.14 * 1.25 squared = 4.91
10 l/s * 4.91 = 49.1
The sand filter can handle the amount of water

Question 8

What is turnover.?

Answer 8

Turnover is the time in hours that the pool volume is fully circulated through the system