Thanks guys. You were right. It's the soil pipe. My neighbour called plumber last night. I guess his drains were blocked too. Later last night, all my drains were unblocked. What a relief.
My bathtub drain became very slow a week ago. My toilet next to it flushed slower too. When I flushed the toilet, from the bathtub drain it would come up with some bubbles and water like a little vocano. Ocasionally the sink drain next to the toilet, further away from the bathtub would bring...
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