Here in the Dallas area swimming pools can lose 2-4 inches of water per week due to evaporation. As a swimming pool owner it is important to ensure you keep your water level up to the middle of the skimmer openings or “throats”. This helps prevent damage to your filter pump and suction side line.
If you have a swimming pool service company taking care of your pool you still will typically need to add water. Note: most swimming pool service companies do not add water due to the liability issues. However even if you have a company that is an exception and does add water, they will typically only be there once a week and as such your pool still is likely to need additional water added.
If you don’t want to have to remember to add water and be responsible for turning it on and off then an automatic fill device can be very helpful. Many new swimming pools come with one built in. If you don’t have a built in automatic fill device then the Pool Sentry can be a great option. We have seen the Pool Sentry for as low as $59 from depending on where you purchase it.
Another option that we’ve recommended is a pool water level controller from Frontgate. It looks a little better perhaps, but we don’t have much experience with them at this point.