Impurities on the ground

Q: I recently purchased a room carpet from a non-Muslim which I intend using as a carpet to perform Salaah on. 

There are no apparent traces of najaasat on the carpet but there are a few stains which look like they may be from food or drink. 

The carpet is too thick and big to be soaked and squeezed. In order to ensure the carpet is paak, must it be washed once, then left to dry; then washed again and left to dry, and washed a third time and left to dry; in order for it to be paak? Or will one wash and soak be sufficient?

Q: Spiders don’t have blood in their circulatory system. They have something else called haemolymph. Is this impure because a few weeks ago I squashed a spider on my carpet in my bedroom, so does that mean this carpet is impure? I’ve also walked all over this carpet with wet feet after wudu sometimes.

Q: I spend a lot of time in the washroom, trying to clean impurities. This is because I worry about impurities like urine touching water which comes on my body. I worry about splashes that come while flushing when they land on the floor. Since the splashes from flushing are impure and there is water on the floor and when impurity mixes with a body of water that is less than a certain length and width (I forgot), the whole water becomes impure so I clean the floor as well and the slippers too because they touch the floor. The splashes from flushing also land on the sink nearby so I wash the sink also. I also have to wash the seat where the same splashes also come. Can I simply use the washroom without washing anything and only see if my body is visibly pure or impure and not worry about coming into contact with water that had come into contact with impurities?

Q: There was 1 drop of urine on my toilet seat and I first dried the seat then poured water from the jug carefully over the seat, while pouring the jug of water over the seat, some water leaked off the seat to the sides and down to the floor. Was this water that leaked najis? And also someone stepped on that water and walked across the house. Is the carpet in the house najis?

Q: A child urinated on a carpet. The urine dried up without anyone cleaning it. If water falls onto the same place, will that water be na-paak?

Q: If a woman's water breaks during pregnancy, is that water pure or impure. If this water fell on a carpet then how should it be purified?

Q: If I flush the toilet after passing urine. While washing the areas of my body I have noticed the bidet splashing water inside the toilet and then onto the seat or floor. This water is coming from inside the toilet. The splashes are few. Some splashes I can wash off. But some fall on the ground.

Does this mean I have to thoroughly clean the floor after every use? 

Q: My little brother got urine on his boots at school (at the bottom and top of shoe) and then walked from school to home in the snow, getting them wet. When he came home, he walked through the living room, spreading the wetness from his shoes all over the house. I did my best to wipe all the wetness off the floor but I don't even know all the places the water from his shoes got. Do I consider my living room to be impure? How can I make it pure again? I will have to mop the living room and the rest of the house, it that ok?

Q: Please can you tell me if the stool of a horse is napaak.

Q: I noticed a child had urinated a small amount on my bathroom floor. I wiped it dry, poured water over that area once, wiped it dry again and then sprayed and wiped with detergent spray once. Is that area considered paak?