After flushing toilet, while tank is filling up, there is a "rumbling" noise coming from the vent pipes, I think. My plumbing is all original, cast iron and steel,new in about 1965 or so. I have 2 "high" water usage, came with the house, toilets on main floor of house, and 1 newer, high water usage toilet in basement of house.
I have tried getting up on snow covered roof and shining a flashlight down main vent stack, as well as all of the stacks. I couldn't see all the way to bottom of any of the stacks, so I tried dropping a small snowball down each one. That, of course, told me absolutely nothing, but it seemed like a good idea at the time in order to check for blockage.
I can't drag a hose on the roof to put water down the vents right now, cause the roof is like I said, covered with snow, so I am at a loss at what else to try. I don't know if the vents are blocked, causing the rumbling noise or if it is something else. Is this noise ,although unusual, something to really worry about, or should I wait for spring and the snow to melt?
I hope I have provided enough information to get some help with this.
Thanks for any help anyone has to offer.
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