I'm not sure if any pump will be right for you, with that much water everyday. Will the water be cloudy, silty, stagnate, or have a lot of algea? This will force you to operate on regular flow, vs. high flow. Your core will eventually clog up so you would have to bring some replacements. I would recommend using a UV sterilizer for water that doesn't need to be filtered from dirt, etc. Along with their micropure tablets. If you bring a filter, I would only use it on the water that you don't have the "stomach" to drink. If you want a great reference with detailed info, check out the Backpackers field guide by Rick Curtis.From riverridgeray. I have a Vario that in "Faster Flow" mode will filter 5 gallons of water in about 7 minutes. However---if you are going to be doing that every day, the water had best be clear or you will eventually clog filters. After 50 gallons or so, you will need to lube o-rings on the valves. Plan on some regular maintenance along the way. If you are not in a hurry, and your water is clear, I would tend to recommend one of the Katadyn drip filters. I trekked in Nepal for 16 days last fall with a small trekking company and 12 friends. We got all our water through 2 Katadyn Base Camp drip filters. The Katadyn ceramic drip filters are slower, heavier, more expensive and tend to last much longer--none are really designed to work with dirty water.Final thought! In Central America, if your water is possibly contaminated by human feces: you are at risk of various viruses, including hepititis A & E. Microfilters do not remove all virus. In Nepal, we microfiltered to remove the more common protozoa and bacteria, then added Micropur Chlorine Dioxide tablets for virus. The combination of microfiltration and chemicals gave us clean, safe water (with no chemical taster) in 15 minutes.Since the UV systems sold here are designed to do 1 liter or less per treatment: multiplying their treatment process to reach 5 gallons per day seems like a stretch of their capacities.