Tahaarat

Q: I was sitting after performing salaah when I noticed that there is a black, sticky substance on my foot through which water could not pass. It was the size of a whole round fingernail, and I had not seen it before.

Then, my brother told me that he saw it since 3 or 4 days on my foot. I had also led jamaat during these days. Will I have to repeat all the salaah that I had offered on these days? Will those who followed me in jamaat also have to repeat their salaah?

Q: If I have treatment done on my face and cannot use water for nine hours, will tayamum suffice?

Q: Is it permissible to use paintbrushes made of horse hair?

Q: If an impurity (e.g. urine, etc.) has to fall into a pool which holds 50 000 liters of water and is on a filter all the time (the water is flowing continuously), will the pool be considered naapaak?

Q: In my pregnancy I've been getting clear or yellow discharge very rugularly.

So sometimes if I'm out and I have slightly more than a Dirham size then I just sprinkle water over it and try to scrape it a bit but it's always wet, not dry. So sometimes I can't wash and change my underwear when I'm out.

Does sprinkling water over suffice?

It worries me because of my wudhu and salaah and it's validity.

Q: If I have olive oil in my hair and I make wudhu/ghusl afterwards, is my wudhu/ghusl accepted?

Q: I was not able to take out one or two strands of pubic hair during shaving. I still made my ghusal for haidh. Was my ghusal valid?

Q: For the permissibility of tayammum, how many kilometers is one shar'ee mile? 

Q: Recently, I had two blisters on my arm, very close to each other, which ooze with pus. When I wash them, the pus starts coming out again. So I put plasters over both these blisters after the pus stopped flowing out. When it comes to performing wudhu, then how do I wash the narrow skin area between the two plasters without getting the plasters too wet?

Q:

1. Is it necessary to make wudhu for each salaah if one has discharge randomly throughout the day?

2. If one salaah was read and by the next salaah time there is no discharge seen nor felt, is it necessary to make wudhu?