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Floating concrete to early will trap the bleed water under the surface causing this problem. A concrete finishers will screed concrete wait for bleed water to come to surface and start evapourating...

Its sewer gases coming from hotwater tank drain, the water has evapourated in the s trap. Pour 1/2 L of water down the drain every three months and this should solve your problem.

The smell is coming out of the drain from the water tank, the water in the s trap has evapourated , pour 1/2 litres of water dowm the drain every 3 month, You are breathing in sewer gases which is...