We had a new kitchen fitted four years ago. The sink is a double drainer (small and larger sink), and the dishwasher and washing machine are plumbed into the same waste pipe below the sink, which has caused a gurgling sound ever since (a reliable plumber told us that the way it has been plumbed is the cause of the gurgling). Recently, there has been a really bad smell (like rotten cabbage) coming from the kitchen sink drain, so we used this as an opportunity to take all of the plumbing apart underneath the kitchen sink to clean it and fit an anti-syphon trap, hoping that this would fix the gurgling and the smell. When we took the plumbing apart, the pipes were all reasonably clean and there was plenty of water in the U-bend, which was not what we were expecting to find, given the bad smell. Now the anti-syphon trap has been fitted, there is no more gurgling; however, the bad smell it still happening! For reference, there are no pipes or drains on the outside of the property. Any ideas what is causing the smell please and how we can fix it?

I am trying to install a scaleblaster since my water is so hard my swamp cooler pads continuously are covered with calcium deposits. The water meter is behind the fence in the backyard at the corner I located the line 5 ft from the meter on the inside of the fence 18in deep. The pipe runs parallel with the fence line under a shed and under a driveway. On this side of the house there is a bathroom and a hose bib on the other side of the house is the kitchen and the water heater. The pipe is Galvanized running from the meter. I cannot connect the scaleblaster to galvanized pipe I want to try and hook it up so that it will cover the swamp cooler pipe as well as the rest of the house. So I'm looking for the pipe coming into the house which I can't seem to find. We don't have a shut off, we don't have a crawl space. I called bluestake 811 they won't come out into the property because it's private so I'm at a loss as to where to find the pipe. The house was built in 1978 so could it be galvanized throughout the house I was told. The water heater has copper pipe running to it and a tankless water heater was put in and that has copper pipe running to it. Can I use a Zircon pipe locator and check the walls? or do I need to dig holes in the backyard next to the house? Any help would be greatly appreciated thank you very much