Zapcaps? There good but take more like 45mins to filter 500ml over 15mins fastcaps.
Plus fast caps are ment to filter upto 4litre I think, zap caps are just about done after 1-2fills 500-1000ml on the 500ml zap cap. So saving $10 per filter if you go with zap caps but depends how much you filter in 1 go if its werth it.
You could have 1000ml to filter then the fast cap would be cheaper as u may need 2 zap caps to filter that
To me it seems like its a preference between fast caps and zap caps. This is my 1st time with either so fast caps won out with me. I'll keep u guys informed