I'm new to the forum, but have browsed a bit before registering. I actually got the lead for this product from here, and then recently bought some bioballz from the guys at www.bioballz.co.za
. Turns out I had the incorrect measurements when working out the volume of the sand filter I was going to put them in, and have a bag and a half of them left.
I paid R3,000 for 3 bags and the shipping from Cape Town to me in Kempton Park. The bag and a half I have left over will be sufficient to fill a 3 bag sand filter. You can have them (brand new and unused) for R1,000 cash (so about a R500 saving), provided you collect from me or we arrange to meet somewhere convenient.
I've had them in for a week now, and the water flow through the filter is much better. The large grain sand they suggest for use in pool filters being used for koi ponds always needed me to open up the filter every week or so to unclog the sand and do a backwash. The bioballz are much better suited for use in the filter.
PM if you're interested