If a woman’s uterus/womb is (completely) removed – due to a medical condition (or other valid reason) – then from a medical perspective, menstruation cannot continue to flow. 

If the sick person performs ṣalāh with the bottle of urine in his pocket, his ṣalāh will not be correct.

If a potter kneads the soil with impure water when making the pot, then the use of such a baked pot made with filthy soil will be permissible and wudhu will be correct with the water that is present in it.

Therefore, the things made of leather e.g. caps, belts, etc. which are available in the market, will be regarded as pure. 

The ruling regarding recycled water is that the body and clothes will not become impure by this water touching it.

If impurity falls into the tank when its water is flowing from both sides i.e. water is being pumped from the well on one side [of the tank] and it is being released out [of the tank] on the other side,

A large body of water (ماء كثير) or 10 x 10 dhira’ is defined as one whose surface area (the product of the length and width) is 100 dhira’ which is equivalent to 225 square feet.

Sometimes, insecticide powder is added to the water to kill the germs. Even though it causes a change in the colour, smell and taste, the liquidity and fluidity of the water remains. To perform wudhu with this type of water is permissible.

If only one of the three qualities of Dettol (colour, smell, taste) becomes apparent in the water [after adding it to the water], then it will be correct to perform wudhu with it.

Zamzam water is blessed water.  It is a Shari responsibility to respect the water and consider its etiquettes.  Therefore, it is makrooh (reprehensible) for a person who does not have wudhu to perform wudhu with it, provided that there is alternative water available,