Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Slow, fragile and expensive replacement filter

This filter is appealing for it's size. I used it for about 5 trips. You need patience to fill one litre bottle... Be careful on the pressure you apply when you pump. The gray cap is fragile and I eventually broke it. By looking at the price of the replacement filter, I realized it was better to buy a new one and I got the Katadyn varia. I am satisfied with it. The replacement parts are less expensive and the water flow is a lot more faster.