Important trials have been taking place with Pop n Gro nappies and the new low temperature detergents on the market which contain a whole host of chemicals that can cause microfibre fabrics to stop working.
Initial results show that nappies which became leaky can be made to work with no problems once the detergent build up has been removed (easily done using clean and fresh).
Important advice for the future is to use only half the recommended dose of detergent and certainly don't follow the advice of some manufacturers that says double the amount!!
Lollipop have formulated their own detegent that will obviously contain no enzymes, perfumes, optical brighteners or anything other than natural ingredients. Be aware that non bio detegents have lots of these things in too.