We have used the swim nappies that are reusable for the past 18 months. They work fine, just rinse or throw in the machine after use. You can get them from Big W for about $8 or Woolworths have them this week for $6. I think all swim nappies only contain a poo, none soak up wee. Ours have been washed 2-3 times a week and are still fine for about 6months before they grow out of them or the heated pool chlorine kills them.