Thanks for the suggestions. I must say, making up my own sand and
getting it evenly mixed does sound a bit of an effort. I like the idea
of watering on a solution of ferrous sulphate (I've seen one oz. in
two gallons recommended as a dilution), but I do take the point about
improving the drainage whether I use sand or a solution. In a year or
two, I might even replace the whole thing, but I've more urgent
projects in hand ATM (like finishing the pond I started last autumn!).


--
Chris

E-mail: christopher[dot]hogg[at]virgin[dot]net