Gritty mix water retention - sanity check
I started using gritty mix here in Australia over a month ago after being introduced to it by fellow GW member pkozul.We use diatomite instead of Turface, although it looks like we now have a local supplier of Turface MVP.
So far I have over 30 shadehouse plants in the mix and all seem to be growing very well despite some hot summer days up to 105 F.
One thing that concerns me is when watering it seems most of the water passes right through.
So I decided to do a measurement test. I selected a pot that hadn't been watered for 4 days of 90F+ weather and was dry with the bamboo skewer test. I measured the volume of mix to be exactly 2000ml ( just over 1/2 gallon)ignoring the volume of the roots.I slowly poured 500ml of water into the mix and placed a bowl underneath to collect the water passing through.
After waiting 15 mins I measured the amount of water in the bowl - 450 mls. Hence the mix retained 50mls which is 2.5% of its volume, Does this number sound right? Seems very low.
Has the mix become water repellant?