It's best if the water is cleaned before you close up the pool.
I see no reason why you would insulate them. When you close your pool for winter you will purge (empty) your pump and pipes. The water in the pool would freeze long before the water will in the pipes under ground.
Doesn't matter because you're going to purge the lines with air when you close it for the winter.
No.
Swimming in a chlorinated swimming pool would not be a problem. However, if it is a lake or untreated pool, I would wait at least 24 hours for the injection site to close before letting them go in the water to be safest.
depends on how close you were before like if you were best buddies than go for it but if not stay clear.
why did some Victorian schools close at 4pm at winter
because they want to swim close to the surface
If one is behind the other and is swimming between the tail you will see him spit out eggs and he is sucking them out to fertilize them. If there are no eggs then perhaps they are just close and happy :)
No, running is not as effective as swimming but it is pretty close. Swimming is great because it works out your legs as well as your arms and upper body at the same time.
close to the poles
to close down or to suffer during winter
5:00