Little Water
Question :

While I wash an object or my body from najasah, and water splashes onto a place which is tahir, will that place also become najis? Is there a difference if the water I am washing it with is Kurr or Qaleel?

Answer :

If the water used in the process of cleaning is little (qaleel), then the water that splashes off the najasah is najis and causes wherever it lands to also become najis. The exception to this ruling is the water used for istinja, (the process of cleaning the private parts after urination or defecation), in which case the water splashes will be tahir.
If 'immune water' is used, then it is tahir after it splashes off the najasah, and does not cause other objects that it comes in contact with to become najis.
Immune water is categorized into three types:
(a) water that has reached the amount of kurr – approximately 464 kg, and it is better to consider it as 470 kg;
(b) water that which has a source, such as spring water, well water, and tap water which is connected to a large tank or mains water supply;
(c) rain water during rainfall.

Under-Kurr Water
Question :

If a najasah comes into contact with under-kurr water, will it become najis even if the amount of najasah, is very little, like a drop of urine?

Answer :

If the water is less than kurr, it becomes najis when it simply comes into contact with the najasah, even if the najasah is very little that it does not cause any changes to the water.

Kurr Water
Question :

If kurr water comes into contact with najasah, does it automatically become najis too?

Answer :

If water reaches kurr, it does not become najis by simply coming into contact with najasah. It becomes najis when the najasah changes the color of the water, its taste or its smell.

Kurr Water
Question :

How much is kurr water?

Answer :

Kurr water equals in volume to 27 cubic hand-spans. Based on an obligatory precaution, the hand-span is equivalent 25 cm. In terms of mass, Kurr corresponds to 464.1 kg, and it is preferred to consider it to be 470 kg.

Rain Water
Question :

If my mattress has become najis by urine, can it be purified by rainwater?

Answer :

The mattress and its interior become tahir when it is soaked with rainwater while it is raining. Removing the water from it through pressing or squeezing is not required for it to become tahir, nor is it necessary to repeat the process.