Knowing when and how to drain pool water is one of the most important skills a Gilbert homeowner can have. If you drain pool water at the wrong time or in the wrong way, you risk serious damage to your pool structure and equipment. Because of this, understanding the basics before you act can save you a great deal of money and stress.
Arizona’s intense heat and hard water create conditions that are unlike most other parts of the country. As a result, pool owners in Gilbert, Mesa, Chandler, and Queen Creek often deal with high levels of total dissolved solids (TDS) and calcium buildup that make periodic draining necessary. However, draining a pool is not as simple as just pulling a plug.
In this guide, the Valley Pool Service team walks you through everything you need to know. We cover the right reasons to drain your pool, the risks involved, the best times of year to do it, and how a professional can help you protect your investment.
Why Would You Need to Drain Your Pool?
Not every water problem requires a full drain. In fact, most water chemistry issues can be corrected with proper balancing and treatment. However, there are specific situations where draining becomes the most practical solution.
High Total Dissolved Solids (TDS)
TDS refers to the buildup of minerals, chemicals, and other particles in your pool water over time. In Gilbert’s hard water environment, TDS levels rise faster than in softer water regions. When TDS gets too high, your pool chemicals stop working effectively. Furthermore, the water can look dull, cloudy, or even give off an unpleasant odor.
At that point, a fresh fill is often the best fix. A pool professional can test your TDS levels and tell you whether a drain and refill makes sense for your specific situation.
Stubborn Algae or Severe Contamination
Sometimes, algae blooms get so severe that standard chemical treatments cannot fully eliminate them. This is especially common after monsoon season in the East Valley. Additionally, if a pool has been neglected for a long time, the water may be so far out of balance that draining and starting fresh is more cost-effective than trying to recover it.
In these cases, a professional green-to-clean treatment followed by a drain, scrub, and refill may be the smartest path forward. Valley Pool Service handles exactly these kinds of situations across Gilbert and surrounding communities.
Plaster Repairs or Surface Work
If your pool plaster is cracking, chipping, or staining severely, your contractor will need to drain the pool completely to access the surface. Moreover, acid washing — a deep-cleaning process that removes scale and stains from plaster — also requires an empty pool. These are valid and common reasons to fully drain your pool in Arizona.
The Risks of Draining a Pool in Arizona
Draining a pool in Arizona carries real risks that do not apply in cooler or wetter climates. Therefore, homeowners should never attempt a full drain without understanding what can go wrong.
Pool Pop-Out (Hydrostatic Pressure)
This is one of the most serious risks. When a pool is empty, groundwater pressure beneath the shell can literally push the pool up out of the ground. This is called a “pop-out” or hydrostatic lift. It is more common during periods of high water table, such as after heavy rains or in certain low-lying neighborhoods near Gilbert and Chandler.
Most pools have a hydrostatic relief valve at the bottom of the main drain to release this pressure. However, that valve must be functioning properly. A professional should check this before any drain begins.
Sun Damage to Pool Surfaces
Arizona’s sun is brutal, especially from May through September. An empty plaster or pebble surface left exposed in direct summer sun can dry out, crack, and blister in a surprisingly short time. Because of this, you should never drain your pool and leave it sitting empty during peak summer heat.
Professionals plan drain-and-refill jobs carefully to minimize the time the surface is exposed. Speed matters when the sun is beating down on an empty shell.
Equipment Damage
Your pump, filter, and other equipment are designed to work with water in the system. Running your pump dry — even briefly — can cause serious internal damage. Additionally, certain automatic pool cleaners and water features can be damaged if they operate without water. Before you drain, make sure all equipment is properly shut down and protected.
The Best Time to Drain a Pool in Gilbert, AZ
Timing matters more in Arizona than almost anywhere else. The ideal window for draining a pool in Gilbert is typically between late February and early May, or again in October and November. These months offer cooler temperatures that reduce the risk of surface damage during the drain process.
Meanwhile, draining during July or August is strongly discouraged. The combination of extreme heat, monsoon moisture, and high UV exposure creates the worst possible conditions for an empty pool. Moreover, the monsoon season raises groundwater levels, which increases the risk of a pop-out.
If you are planning a drain and refill, talk with a pool care expert well in advance so you can schedule it during a safe weather window. Planning ahead prevents costly emergencies.
How to Drain a Pool Safely: Step-by-Step Overview
While a full DIY drain is possible, it involves more steps than most homeowners expect. Here is a general overview of how professionals approach the process.
- Test the water first. Confirm that draining is truly necessary based on TDS, hardness, or other chemical readings.
- Check local regulations. Gilbert and the broader Maricopa County area have rules about where pool water can be discharged. Draining onto the street or into storm drains may violate local ordinances. Pool water should typically be discharged to the sanitary sewer or a designated area.
- Inspect the hydrostatic relief valve. Ensure it is working before you begin.
- Shut down all equipment. Turn off the pump, heater, automation system, and any water features.
- Use a submersible pump or drain through the main drain. A submersible pump placed in the deep end is a common and efficient method.
- Monitor the process closely. Never leave a draining pool completely unattended.
- Complete surface work quickly. Once empty, any repairs, acid washing, or cleaning should be done as fast as possible.
- Refill and rebalance immediately. Begin filling the pool right away and test chemistry once it reaches the proper level.
Each of these steps requires attention to detail. Furthermore, mistakes at any stage can lead to expensive repairs. This is why many Gilbert homeowners choose to have Valley Pool Service handle the entire process from start to finish.
Partial Drain vs. Full Drain: Which Do You Need?
Not every situation calls for a complete drain. In some cases, a partial drain — removing a portion of the water and replacing it with fresh water — is enough to bring TDS levels down and restore proper balance. This approach is faster, less risky, and easier on your pool structure.
On the other hand, if the water is severely contaminated, if plaster work is needed, or if acid washing is required, a full drain is the right call. A professional inspection will help you determine which approach is appropriate for your pool’s current condition.
Additionally, some newer technologies offer an alternative to draining. Reverse osmosis (RO) water treatment can filter and recycle your existing pool water, lowering TDS without draining the pool at all. However, this service is not always available and may not be cost-effective for every situation. Ask your pool technician what options make the most sense for your specific pool.
Local Considerations for East Valley Pool Owners
Pool owners in Gilbert, Chandler, Mesa, and Gilbert Ranch share many of the same challenges. The East Valley’s water supply tends to be high in calcium and magnesium, which accelerates mineral scaling inside your pool and equipment. As a result, TDS levels often climb faster here than in other regions of the country.
Monsoon season also plays a big role. Heavy rains can dilute your pool chemistry quickly and introduce debris, algae spores, and contaminants. Moreover, the rapid evaporation that follows a monsoon storm can spike your chemical concentrations almost overnight.
Because of these local conditions, East Valley pool owners often need to drain and refill their pools more frequently than homeowners in cooler climates. Staying on a regular maintenance schedule helps you track TDS levels and catch problems before they escalate. Request a free quote from Valley Pool Service and find out how we can keep your pool healthy year-round.
Frequently Asked Questions About Pool Draining in Gilbert
How often should I drain my pool in Arizona?
Most Arizona pools benefit from a full drain and refill every few years, depending on water quality and usage. However, regular water testing will tell you when TDS levels have reached the point where draining is necessary. Your pool technician can recommend a schedule based on your specific water conditions.
Can I drain my pool myself?
Technically, yes. However, the risks involved — including pop-outs, surface damage, and equipment harm — make professional help strongly advisable. A trained technician has the tools and experience to drain your pool safely and efficiently.
How long does it take to drain and refill a pool?
It depends on your pool’s size and your water source flow rate. Generally, draining takes several hours, and refilling can take a full day or more. Therefore, planning ahead and scheduling during mild weather is essential.
Is it legal to drain a pool into the street in Gilbert?
No. In Gilbert and throughout Maricopa County, discharging pool water into streets, storm drains, or waterways is generally prohibited. Pool water should be directed to the sanitary sewer cleanout on your property. Always check current local regulations or ask your pool professional to ensure proper disposal.
What happens if I leave my pool empty too long?
Leaving a pool empty for an extended period, especially in summer, can cause serious damage. Plaster and pebble surfaces can crack and blister. Furthermore, the pool shell can shift or pop out of the ground due to hydrostatic pressure. Always plan to refill as quickly as possible after any necessary work is completed.
Let Valley Pool Service Handle Your Pool Draining Needs
Draining your pool is a serious task that requires the right knowledge, timing, and equipment. The Valley Pool Service team has years of hands-on experience helping Gilbert homeowners drain, clean, repair, and refill their pools safely. We know the East Valley’s water conditions, local regulations, and seasonal risks inside and out.
Whether you need a full drain and refill, a partial water replacement, or a professional assessment of your current water quality, we are ready to help. Our technicians will inspect your pool, explain your options clearly, and get the job done right the first time.
Do not take chances with one of your home’s most valuable features. Contact Valley Pool today to schedule a service visit and keep your pool clean, safe, and swim-ready all year long.
