Can you use a 1 horsepower pool pump for your in ground 26000 gallon there are 4 intakes and one half inch pipes?

A 1 horsepower pool pump is not suitable for your 26,000-gallon in-ground pool. The ideal pool pump size for your pool is determined by factors like pool size, turnover rate, and plumbing size. Generally, a 1.5 to 2 horsepower pump would be more appropriate for your pool's size and plumbing. For accurate sizing, it's best to consult with a pool professional or use a pool pump calculator.