Quick take
The common 0.75 L Water-to-Go filter is rated around 200 liters under stated conditions. Replace on capacity/time guidance and sooner if damage, storage issues or performance concerns arise.
Rated capacity
Around 200 liters is the key benchmark for the common 0.75 L format, but actual use conditions vary.
Priming matters
New cartridges should be prepared exactly as instructed before first use so flow and media wetting are correct.
Travel storage
Long storage, freezing or contamination can affect a portable filter differently from normal daily household use.
Recurring cost
For frequent travelers, annual cartridge spend can be compared against WaterH and other portable systems on cost per rated liter.