Platypus DayCap In-Bottle Filter

What it removes from water, and how well that is proved. 8: Clearly better than most.

0.2 µm hollow-fibre filter. Platypus says each one is individually tested to EPA and NSF guidelines for 99.9999% of bacteria and 99.9% of protozoa: a named standard for bacteria and protozoa, so 4. No virus claim.

How fast clean water comes through when it is new. Real flow drops as it clogs: see Ease of use. 4: A bit below average.

Platypus gives 1 L/min, drinking through the spout with a new filter and clean water. 0.6 to 1.19 L/min. UKC found it took a few flushes of water through the filter to reach full flow.

How much it adds to your pack. 9: Among the best you can buy for this.

74 g for the cap and filter (Platypus). Under 90 g. UKC and Ultralight Outdoor Gear both give 65 g: same band. You also carry a wide-mouth bottle, which is not counted.

Filling, squeezing or pumping effort, how fast it clogs in peaty or silty water, and how easy it is to clean. 9: Among the best you can buy for this.

Fill the bottle and drink: no squeezing, pumping or backflushing, and UKC cleans a clogged filter by shaking the bottle half full for 30 seconds. SectionHiker (5) and Hiking Trails (5) rate it very easy. Treeline (4) says it takes only a light pull, almost as easy as normal drinking, but is awkward for moving water into a pot. UKC (4) found it needed a few flushes to reach full flow. Average 4.5 out of 5, so 9 out of 10. Treeline's write-up is part of its water filter roundup, with its own hands-on test of the DayCap. SectionHiker had a free sample, which it says.