Scuba Diving Tank Equipment with 15-20 Minutes Capability, Mini Oxygen Tanks for Breathing, 1L Portable Dive Oxygen Tank, Pressure & Corrosion Resistant Material with Refillable Design

Very impressive all round

Ignore the one star from the guy who thinks this tank is for pure oxygen (and his supposed 45 years experience?), you can fill this tank yourself and of course it's compressed air not oxygen as anyone who has ever scuba-dived would know. This is great for snorkelers who want to go down a bit further

Firstly, Extracting pure ‘Oxygen’ from air is an expensive process which is not achieved with a hand pump!Secondly, Scuba divers do not use 'Oxygen' cylinders except in cases of emergency at the surface. Instead, they use 'Compressed Air.' This is ordinary air found above ground level anywhere in the world which is then compressed (with the use of an expensive 'Compressor') into the diving cylinder at great pressure. In simplistic terms, that compressed air is then eked out little at a time, to the diver throughout the length of the dive.Leaving aside all other issues I will explain the maths. The air we breathe is made up of 21% Oxygen which, when breathed at depths of over 85 metres (approx 275 feet) turns toxic (i.e. poisonous!) and will kill. BUT!, if those same diving cylinders were filled with 100% Oxygen it turns toxic at depths of just 10 metres (33 feet!) as any competent diving instructor will explain.One customer has asked if this is all the equipment his children need for scuba diving in their swimming pool. I wonder if he’s now checking the depth!!!If the manufacturers of this questionable item of equipment do not understand the basics of oxygen, air, depth and scuba diving in their most rudimentary forms they should NOT be making such equipment. Avoid all contact with this device. It is clearly not fit for purpose and certainly not fit for the minimum one star rating I am required to give.NM(Active diver/instructor for 45 years)

Clearly the comments from from the single star review is based on a complete misunderstanding of the tank. These types of tanks are often referred to as oxygen tanks but clearly they are not for pure oxygen. Anyone with an oz of knowledge would understand that and not waste time with rabbit hole discussions