How long can swans hold their breath?

How many gallons of water are in a 15-foot round above ground swimming pool with a 4ft? How can you most accurately measure your 2k rowing time on a Concept II Model B erg? How should pool water be treated after finding a dead bird in water? What would be the best way to fix a 20 X 40 in-ground liner pool with concrete damage in the deep end? When does the Lawrence state pool open? Is the Btu rating of a pool heater the input Btu of the gas or the transfered Btu going into the water? What body of water is around Cebu City Philippines? Is a 1.5hp Hayward Northstar pump sufficient for a 47000 gallon 24 x 48 pool with 2 skimmers 6 returns a 30 inch Hayward sand filter 1.5 inch pipes where the pump is 100 feet from the pool? What is the best bottom for a above ground pool? How do i measure the amount of water in a 20'x10' x4' pool? When did Schwinn reproduce the stingray? Do you need chlorinator if you use the BBB method? How can you figure out why you're not getting enough suction pressure in your inground pool even after cleaning the filter and making sure no lines are clogged? Why does baquacil floccuant foam? What type of clothing does Tom Daley wear when diving? Why be concerned about pool alkalinity? What is the difference between a skimboard and a surfboard? How much money do deep sea divers earn? Where can you buy water babies? How does using EANx affect narcosis while diving?