On 16/08/2014 12:18, Spider wrote:
I have been wondering about using Hydroleca as a substitute for aquatic
compost when potting up pond plants. There's probably a very good reason
why I've never heard of it being done, despite its being used for
hydroponics. Perhaps it's too light? I'd be interested in other
urglers' opinions/experience.


I imagine it has similar properties to vermiculite and perlite. Yes,
very light when dry, BUT extremely heavy when wet. They recommend it for
roof gardens, which doesn't make much sense.