Since my message above I hired a machine called rug doctor to wash the carpet in the room.
Water is filled in to the machine. The machine discharges water in to the carpet and sucks it back up in to a separate tank which is then detached from the machine & emptied when it gets full.
At the time of emptying the dirty water from this tank in to the sink, some drops of water will run down the outside of the tank.
This tank is then re-attached to the machine so that it sits above the tank in to which clean water is poured.
When this tank is removed again to empty the dirty water, the bottom of it touches the part of the machine where dirty water drops have settled.
Therefore when this tank is re-attached to the machine after emptying the dirty water, the clean water from the machine does touch the outside of this tank due to the machine being moved around whilst it is being used to clean the carpets.
This is because, as mentioned above, the dirty water tank which collects the dirty water, sits above the tank in to which the clean water is poured.
Therefore when the machine is moved around to clean the carpet, it swishes around and touches the outside part of the dirty water tank which sits above it.
Therefore any dirty water drops which are on the underside of the dirty water tank will inevitably mix with the large volume of water in the clean water tank.
Only after washing the carpet did this issue occur to me.
The carpet in question is at my parents house. There is obviously no smell or visible napaaki on it because dirty water that would have mixed with the clean water will be a a trace amount.
I am under immense pressure.
Do I tell my parents that the carpets need to be re-washed or do I regard it as paak?
I do not know what to do. I am severely perturbed and need definitive guidance.
Is it now paak? Is the carpet safe for them to walk on with wet feet & to perform Salah on? Yes or No. I need an answer quickly as I am all over the place mentally
الجواب وبالله التوفيق
As per the situation described in your question, until there is no surety that drops of impure water have mixed with clean water, the clean water cannot be considered as impure. Mere suspicion cannot lead to rendering a pure thing to be considered as impure.
ھکذا فی کتب الفتاویٰ
واللہ اعلم بالصواب