a truly awful job has been on my list for months ! but with guests in the gite at the weekend i decided to fix the dodgy concrete cover and seal it up to avoid nasty smells drifting onto the terrace. when i opened it -to my surprise it was full - we had it emptied about 4 months ago.the top was fairly crusty and solid ! yuk can someone please advise if this is normal or not as we have only recently moved to france. nb we dont use bleach or any products containing bleach. regards steve