On 16/08/2014 12:39, stuart noble wrote:
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.

It is not much heavier than the water it contains in its pores so around
1kg/L maximum. By comparison gravel tends to be 2-3kg/L.

--
Regards,
Martin Brown