- Chris Neaves wrote:
- There used to be piles lying in the veld in the Free State.
Chris
Hi Chris, I think it could have been lava rock lying in the veld? They sometimes look very much the same. Last year I collected bags of Lava rock lying in the veld at the Sun City Nature reserve and brought it back to Cape Town for my ponds.
AlfaGrog are manufactured in the U.K. by sintering selected fireclays at very high temperatures, resulting in a foamed ceramic porous mass. By crushing and screening the material a range of grain sizes are produced.
In the US, Alfagrog is sold as Supra.
I sold Alfagrog a few years ago and found that it is fantastic.
On one of my ponds, I only have a waterfall cascading down into a 30 liter bucket filled with Alfagrog and oyster shells before the water finally enters the pond. No other filtration apart from a sand filter, and with 35 fish in a 10 000 liter pond. I never had any Ammonia or Nitrite problems.
I am still using it in various ponds, and in my aquarium filter with great success.
If you have limited space, that is the way to go. At least 50x more surface area than bioballs. Approximately R 50 per liter.
As Chris said, it is very important to use it in a correct way. The best is to place it in veggie bags to enable you to lift it a bit from the bottom and to enable you to clean it easily. I also add oyster shells to the bags to buffer the Ph. The water flow
through it is very important.