Best litter box and how to litter train

[HumanWithFurryPotats]

Hello, I have just discovered what litter training is, and I wish I had known sooner!
Anyone know any good litter boxes for a guinea pig cage, and also how to do it?

Thanks for the help.

 

[flowerfairy]

I use flatish black plastic trays sold by ikea as shoe racks. I put newspaper and hay on them (2 between five guinea pigs). I also use an old magazine rack as a hay rack.

Guinea pigs tend to wee where they eat so most of their wee goes in the trays.

I also put extra bedding under their beds. They poo everywhere!