Although this type of filter general can be said, it seems that processing precision of the mounting thread part is bad or it is loose and there is no pressure resistance. When sealing the final stage and applying the pressure of tap water (probably 0.3 MPa), water leaks from the screw part. I used it up to about 100 L, I endured it but decided to change it.
I use the purified tap water in a plastic bottle instead of mineral water. I do not mind if this is how it is used, but because the specified amount of water in the instruction book is 1 liter per minute, even the maximum water volume is 1.9 liters, it is not suitable for direct connection to the faucet. If you connect directly to a faucet, we recommend a hose nipple around 15 mm on the tube side.
Although the type of impurities that can be filtered by this may be small, there is no problem for the amount used for the fish tank of the tropical fish It seems that if it is chlorine and trihalomethane position it can be removed without problem.