English to Russian Tech/Engineering Engineering: Industrial Mining

Помогите пожалуйста в правильном переводе данной фразы.. Смысл понятен, но как перевести, чтобы звучало прилично - не получается!
"Although South Africa has made significant inroads into the backlog in sanitation by the provision of pit latrines, very little with regard to the management of pit latrines once they are full, has been done, particularly with regard to their sustainability."
Спасибо заранее.