I was wondering if anyone had any input on the best water filter for use in springs and streams with very low water? The area we hunt doesn't have easily accessible creeks, but does have a small spring nearby. There's about 2" of water depth in spots so it is very difficult to use sawyer squeeze or gravity type systems. I have used a friends pump filter before but it is pretty slow. Is a pump filter the best way to go, any recommendations? Thanks.