In breathing, a fish uses up the oxygen contained 
in the water. If oxygen is not put back, the fish will 
drown. Many aquarists unknowingly keep their pets 
on the verge of drowning, and only avoid actual catas¬ 
trophe by frequently changing the water. 
Plants put oxygen into the water, but are satisfac¬ 
tory only when properly illuminated and proportioned. 
Best results are obtained when the aquarium is 
continuously aerated by releasing a stream of fine 
air bubbles from a submerged porous stone, connected 
by a small rubber tube to an air pump. The fish will 
live and thrive, and change of water will be practically 
unnecessary. 
The White Mist air pump was developed expressly 
for aeration. A few of its advantages are that it never 
requires oiling; it is built to run continuously at a cost 
of less than 6c per month for electricity. This is ap¬ 
proximately 1/10 of the usual cost for other methods 
of aeration. The pump is practically silent, and does 
not interfere with the radio. There are no bearings or 
pistons to wear. 
The White Mist air pump is an extremely simple 
and long-lived mechanism. Its working principle*’ 
briefly, is as follows: 
A U-shaped steel bar, vibrated by an electro-mag¬ 
net, works a sturdy little bellows. The bar is tuned 
to synchronize with the vibrations of the alternating 
* Patents Pending 
