I don't spend a single penny for the bedding!

I say the truth when I say that there is no smell, but sometimes family members simply don't like pets indoor... it is not for the smell.

Anyway, I want to share also with you the pics of the way I have arranged the cage; maybe it can be useful for some good idea.
I built the cage using the correx as a basis (it is a plastic easy to fold, i bought it in those Brico shops). Into this basis I put different layers of materials:
1st layer is made of old towels which remain dry and clean; they work for getting a softer and more comfortable floor
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on the towels I put the paper. You can use newspapers, but I use supermarkets leaflets because I get ton of them here in my building
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on the layer of paper you put the fleece. The fleece is a simple piece of fabric. Before using it you have to wash it 2-3 times in very warm water without any softener. The fleece is ready when the water passes through it and can be absorbed by the underneath layer (which can be a puppy pad or a newspaper). The fleece remains dry (I have a piece of a lovely fleece which does not work at all... I cannot use it because it remains wet unfortunately).
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Once a day (possibly) you need to remove this fleece with all the leftover, poo and dirty hay (look above). You shake this fleece on the floor and the with the broom you throw everything into the bin.
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I put the fleece outside the balcony for some cool air, if the weather is good...
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In the meantime the piggies are having their floor time into the kitchen which I have arranged for them in a simple way... using recycled and old objects (boxes, yoga mats, a box for the hay, etc)
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Then I remove only the 2-3 leaflets which have some wet spot. And I check also the quality of the wee... the paper shows calcium residuals, colour, etc. If I had a doubt I would take this paper to the vet...
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I put some new leaflets and then the fleece again, which I wash maybe twice a week, but believe me, it is only for changing the colour of the cage! the fleece does not smell (of course if you put your nose on it, well, you can feel some odour... ). A friend of mine came here, she does not like pets because in her opinion they smell and she said that there is no smell at all here... Consider that in summer I hardly ever open the windows! it is so hot that I always have air conditioning switched on.
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You can use this method also in that closed balcony. I don't think the humidity is a problem and here in the building the lady who looks after the cats use the fleece also for the cats, who often sleep outside (and here we have 100% humidity in the night during winter; the cars and the roads are totally wet in the morning).
Check the temperature into the balcony, there are special (cheap) thermometers which record the min and max temperature. If you see that in the night temperature goes down, that heater which I suggested will be very useful and the electricity bill will not change so much because the heater is on only when the temperature goes down. The heater removes also the humidity.