Hey all - I had a new pool guy close my pool this year.
Something made me a little nervous.
He used what he called periscopes on the water returns. I don't know if this is a common term - so I will explain it.
He screws in a 90 degree pvc tube into the water returns so the top sticks out of the water and he uses this to pour in the anti-freeze after blowing out the air in the lines - and then plugs the top.
Here is what makes me nervous: The periscopes didn't seem to be all that tight when installed. While blowing out the water from the lines, I could see air bubbles coming out of the threads of the returns. My noob thoughts are - if air is coming through - water can leak back in.
With the anti-freeze poured in, should I or should I not be worried?