Knowing when and how to drain pool water is one of the most important skills a Gilbert homeowner can have. Many pool owners overlook this task until a serious problem forces their hand. However, planning ahead can save you time, money, and a lot of frustration.
Arizona’s intense heat and high mineral content in tap water create unique challenges for residential pools. Over time, your pool water accumulates dissolved solids, calcium, and chemicals that no amount of balancing can fully correct. Because of this, a full or partial drain becomes necessary every few years.
In this guide, we walk you through everything you need to know about draining your pool in Gilbert, AZ. We cover when to drain, how to do it safely, and what to watch out for along the way. Let’s dive in.
Why Gilbert Pool Owners Need to Drain Their Pools
Gilbert’s desert climate is tough on pool water. The sun beats down for most of the year, and evaporation is constant. As water evaporates, it leaves behind dissolved minerals, salts, and chemicals. These build up over time and make it nearly impossible to keep your water properly balanced.
Additionally, the tap water used to refill your pool already contains calcium and other minerals. With each refill, those minerals accumulate further. Eventually, your pool water reaches a saturation point that chemical treatment simply cannot reverse.
Signs It’s Time to Drain Your Pool
Not sure if your pool needs a drain? Here are the most common signs that it’s time to act:
- Cloudy or dull water that does not clear up with treatment
- Calcium scaling on tile, plaster, or equipment
- High total dissolved solids (TDS) readings on a water test
- Cyanuric acid (CYA) levels that are too high to correct with chemicals
- Persistent algae that keeps returning despite treatment
- Water that feels rough or irritates eyes and skin
If you notice any of these issues, it is worth having a professional inspect your water chemistry. A simple test can confirm whether a drain is necessary.
How Often Should You Drain a Pool in Arizona?
Most pool professionals recommend draining and refilling a residential pool every three to five years in Arizona. However, this timeline varies depending on your pool usage, water source, and maintenance history.
Pools in heavily used households may need more frequent draining. Meanwhile, pools with consistent chemical maintenance and lower bather loads may go longer between full drains. The best way to know for certain is to test your TDS and CYA levels regularly.
Partial Drains vs. Full Drains
Sometimes a full drain is not necessary. A partial drain — replacing roughly one-third to one-half of your pool water — can effectively dilute high mineral or chemical levels. This approach works well for homeowners in Chandler, Mesa, and Queen Creek who want to refresh their water without a full shutdown.
On the other hand, a full drain is required when you need to acid wash the plaster, repair the shell, or resurface the pool. A full drain is also the right choice when TDS or CYA levels are extremely high. Therefore, it’s important to assess the situation before committing to either approach.
The Right Time of Year to Drain a Pool in Gilbert
Timing is critical when you decide to drain pool water in Arizona. You should never drain your pool during the hottest months of summer. The intense heat and direct sunlight can damage exposed plaster or fiberglass surfaces within hours.
The best time to drain your pool in Gilbert is during the cooler months, typically between October and April. During this window, temperatures are mild and the risk of surface damage is significantly lower. Additionally, your pool will spend less time empty, which reduces stress on the shell.
Avoid Draining During Monsoon Season
Arizona’s monsoon season runs from mid-June through September. Heavy rain can cause the water table to rise quickly. As a result, an empty pool shell can actually float or shift if groundwater pressure builds beneath it. This is known as hydrostatic pressure, and it can cause serious structural damage.
Furthermore, draining during monsoon season creates an unpredictable refill timeline. You should always plan your drain when the weather is stable and dry. If you’re unsure about the risks in your specific neighborhood — whether you’re in Gilbert, Ahwatukee, or Tempe — a local pool professional can help you assess the conditions.
How to Drain a Pool Step by Step
Draining a pool is a multi-step process that requires the right equipment and careful attention. Here is a general overview of how it works. Keep in mind that hiring a licensed pool professional is always the safest choice.
Step 1: Test Your Water First
Before you drain pool water, test your current chemistry. This confirms that a drain is truly necessary. It also helps you plan whether a partial or full drain makes more sense for your situation.
Step 2: Check Local Regulations
Gilbert and the broader Maricopa County area have rules about where pool water can be discharged. You typically cannot drain pool water directly into a storm drain or onto the street. Most homeowners discharge into the sanitary sewer cleanout or onto a dry portion of their landscaped yard. Always check with your local municipality before draining.
Step 3: Turn Off and Protect Your Equipment
Before the water level drops, turn off your pump, heater, and any automation systems. Running a pump without water causes serious damage very quickly. Additionally, cover or protect any exposed fittings and equipment from the sun while the pool is empty.
Step 4: Use a Submersible Pump or Main Drain
A submersible pump is the most common tool used to drain a residential pool. It moves water efficiently and allows you to control where the water flows. Some pools also have a main drain that can assist with the process, though this varies by pool design.
Step 5: Clean, Inspect, and Refill
Once the pool is empty, inspect the shell, tile, and equipment fittings carefully. This is the ideal time to acid wash the plaster, patch cracks, or address any structural concerns. Then refill the pool as quickly as possible to minimize exposure time. Finally, balance your water chemistry before resuming normal operation.
Risks of DIY Pool Draining
Draining a pool on your own carries real risks. Improper drainage can lead to costly damage, code violations, or even structural failure of the pool shell. Many homeowners in Gilbert and surrounding East Valley communities have learned this lesson the hard way.
Moreover, if you leave your pool empty too long in the Arizona heat, the plaster can crack and blister. Fiberglass pools are particularly vulnerable to floating if groundwater pressure is not properly managed. These repairs can be very expensive. Therefore, working with an experienced pool technician is always the smarter choice.
If you are considering draining your pool, we encourage you to contact Valley Pool before you begin. Our team can assess your water chemistry, evaluate your equipment, and walk you through the safest plan for your specific pool.
What Happens After You Refill Your Pool?
Refilling your pool with fresh water is just the beginning. New water from a Gilbert tap will still contain minerals and may have an imbalanced pH. Because of this, you need to test and balance the water thoroughly before anyone swims.
Your technician will test for pH, alkalinity, calcium hardness, and chlorine levels. They will then add the appropriate chemicals to bring everything into range. This startup process is critical — improperly balanced fresh water can damage your new plaster or irritate swimmers.
Consider a Startup Chemical Treatment
A professional startup treatment after a refill protects your pool surface and equipment. It also prevents early algae growth and scaling. Additionally, a startup visit gives your pool technician a chance to check all equipment and ensure everything is running correctly after the drain cycle.
Frequently Asked Questions About Pool Draining in Gilbert
How long does it take to drain a pool?
Most residential pools take between eight and fourteen hours to fully drain using a submersible pump. Larger pools or those with slower pumps may take longer. The refill process typically takes a similar amount of time, depending on your water pressure.
Can I drain my pool myself?
Technically, yes — but it comes with significant risks. Improper draining can damage your pool shell, violate local discharge rules, or cause equipment failure. We strongly recommend hiring a licensed pool professional, especially for a full drain.
Is it okay to drain a pool in summer in Arizona?
No. You should avoid draining your pool during Arizona’s summer heat. Exposed plaster and fiberglass can crack or blister within hours in extreme temperatures. The safest window for draining is October through April.
What is TDS, and why does it matter?
TDS stands for total dissolved solids. It measures the concentration of dissolved minerals, salts, and chemicals in your pool water. When TDS levels climb too high, your water becomes difficult to balance and can feel harsh on skin and eyes. Draining and refilling is the most effective way to lower TDS.
Does Valley Pool Service handle pool draining in Gilbert?
Yes! Our team handles pool draining, cleaning, chemical startup, and equipment inspection throughout Gilbert and the surrounding East Valley. We make the process safe, efficient, and stress-free for homeowners. Reach out to talk with a pool care expert about your specific situation.
Trust Valley Pool Service to Drain and Refresh Your Pool
At Valley Pool Service, we know Gilbert pools inside and out. Our experienced technicians understand the unique challenges of Arizona’s climate, water quality, and pool equipment. We are here to make sure your drain goes smoothly and your pool comes back clean, balanced, and swim-ready.
Whether you need a partial water change or a full drain and acid wash, our team handles every step with care and professionalism. We serve homeowners throughout Gilbert, Chandler, Mesa, Queen Creek, and the broader East Valley.
Do not take chances with your pool. Request a free quote today and let our team protect your investment. We will explain your options clearly, answer your questions honestly, and get to work right away. Your pool deserves the best — and so does your family.
