There is a tendency for people to just get the biggest pump that they can afford and be done with it. But the sad truth is, if a pump is bigger than what is required for your pool then you’re not only incurring heavier power consumption expenses but you’re also overpowering your filter system, making it wear out much faster than when the right pump is used.
On the other side of the coin, if the pump is too small, then your pool will become more prone to algae infestation as your pool water won’t be totally circulated and filtered. This will lead to the pool having dead spots or parts that the water stays stagnant and becomes a haven for algae, moss, and other pool baddies.
Hint: If the far edges of your pool is prone to algae infestation then this might be a sign that your pool pump is undersized.