more the detail concerning the "urine problem"

[gerbils4]

hello , here are some more details , maybe it will help someone to identify the problem - I have two gerbils , I don't use wood chips bedding , only toilet paper and cardboard . after someone has mention it could be a problem of a dripping water bottle , I checked , and saw it is dripping but only a little bit. maybe this causes the problem ... but I dont understand why . oh , and I put fresh sand every three days so they can play in it. the last thing is that they have a wooden house as a nest and it smells worst then anything else . does it help to find out the origin of the problem ? I don't think it is a bladder problem , because both  gerbils are doing it , and it seem quite natural , they even make this "digging" movement right after . thanks hila.     --------------------------------------------------------------------------------------------------------------------------------------------------------------- this is the first message , in case you have no idea what I am talking about . --------------------------------------------------------------------------------------------------------------------------------------------------------------- hello all I love my gerbils and I dont mind giving them all the space they need in my room , I dont even mind the animal scent they produce the problem is with ... well , their urine . I dont know if it just my gerbils , or maybe all gerbils are like that , but when ever they are in a "new" place the first thing they do is to mark it with their urine the thing is that they consider their place as "new" every time after I have cleaned it ! so in a few hours it has such a smell that I'm having a problem to even get near it . does anyone has this kind of problem too ? do you have any suggestions what can I do ?   thanks hila. -----------------------------------------------------------------------------------------------------------------------------------------------------------