Sometimes The Water
Needs A Reset.

There is no correct interval, and any company that gives you one without testing your water is guessing. Some pools go years on well-managed water; others need replacing sooner because of how they are topped up and dosed. What decides it is the readings — cyanuric acid, calcium hardness and dissolved solids — measured against what your fill water already contains.

Usually not. Because fill water contains no cyanuric acid, a partial replacement lowers it proportionally — replace half the water under good mixing and you roughly halve the reading. That makes partial drains the normal answer for high CYA, and full drains the exception.

Yes, but only down to your fill water. This is the part that catches people out: dilution moves the pool toward the concentration of what comes out of the hose, not toward zero. In Mesa that floor is roughly 205 to 220 ppm, so a pool at 800 ppm cannot be diluted to 300 with a small partial replacement the way the same maths would work for stabiliser.

Chemistry can manage the scaling tendency — keeping pH and alkalinity where they belong changes whether the calcium in the water tends to deposit. What chemistry cannot do is physically remove dissolved calcium. Past a certain point, replacing water is the only lever left.

It is not a blanket no, but it is the hardest time to do it and the least forgiving of delays. The risk is not the draining — it is the time the plaster spends exposed to sun and heat before the pool is refilled. Which is why the refill gets planned before the drain starts, and why autumn is the comfortable window for a big correction rather than July.

It is a real phenomenon and an uncommon one. An empty shell has lost the water weight that was holding it down, so where groundwater is high it can be pushed. It is site-specific rather than universal, which is exactly why the site gets assessed before a full drain rather than after.

Less time than most people assume, and there is no safe universal number. Plaster is designed to live underwater, and in direct Arizona sun a dry finish can dry unevenly and craze permanently. Treat an empty pool as being on a clock: the goal is not to drain it, it is to get water back in it.

It can, in two ways. Exposure — sun and heat on a dry surface. And startup — refilling with unbalanced water and leaving it, which lets aggressive water work on the finish from day one. Both are avoidable, and both are about what happens around the drain rather than the drain itself.

Mesa publishes two endorsed routes and neither needs a permit or notification: onto your own landscape so it percolates into the ground, or into your home's sanitary sewer cleanout. Mesa discourages the storm sewer system — and its own brochure calls it prohibited — noting that the city defines its storm sewer system to include curbs and gutters, so draining "just to the curb" is not a way around it.

It depends which city you are in, which is exactly why this is worth checking rather than assuming. Gilbert and Queen Creek both allow a curb-and-gutter route under stated conditions including dechlorination. Mesa directs you away from it. Apache Junction requires anything leaving your property to be dechlorinated and visually clear, and its city code separately prohibits discharging pool water into public streets. Saltwater pools are called out separately in Gilbert, which says not to drain them in the street.

All six cities allow it and none requires a permit for it. Mesa asks that the water be near neutral, pH 6 to 8, and that you shut off power to the filtration system and the auto-fill first. Queen Creek warns it is only for homes on the public sewer — septic systems are not designed for the volume. Gilbert says never to plumb a permanent connection from the pump to the cleanout. Chandler and Tempe both cap the flow: Chandler recommends no more than 12 gallons per minute, Tempe asks for less than 12. Chandler also warns that using a cleanout in the wall rather than at ground level risks backing water up into the house.

No permit in any of the six cities we serve, for a normal residential drain. Gilbert says no permit but you must follow its guidelines. Queen Creek's FAQ says "a permit is not required at this time" — their hedge, worth keeping. Mesa requires no permit or notification for either of its endorsed routes. Two cities add a step short of a permit: draining to the street in Chandler is an exception you request on the city's form and then post on site, and Tempe requires authorization from Environmental Services before you drain a residential pool over 35,000 gallons.

On some plants, carefully. Pool water carries more salt than tap water and both Mesa and Gilbert publish salt-tolerance plant lists telling you what not to use it on. Mesa's "do not use" list includes fruit trees, roses, star jasmine, hibiscus, vegetables and annual flowers. Gilbert's names annual flowers, vegetables, Algerian ivy, star jasmine, salvia and verbena.

Yes, and this is half the job rather than an afterthought. Fresh fill water is new, not neutral — it arrives with its own pH and alkalinity and, in Mesa, roughly 205 to 220 ppm of calcium before anything is added. It also has no sanitiser and no stabiliser, which in Arizona sun is not a state to leave a pool in.

No. An acid wash is work on the surface itself, which means the pool has to be empty. Worth knowing that the wastewater from that job is treated differently — Mesa states that wastewater from pool repair activities is not allowed into either the storm sewer or the sanitary sewer, because it can carry solids and high chemical concentrations.

We do not publish a figure, because the honest answer depends on things we would be guessing at: your pool volume, whether it is a partial or full replacement, the discharge route available at your property, the water itself, and whether other work is happening at the same time. Tell us what your readings look like and we will give you a real number rather than a range that means nothing.

Mobile treatment services that filter pool water on site and return it exist in some markets, and they are a genuinely different approach to the same problem. It is not a service we offer, so we are not going to describe how theirs works or what it costs — but if that is the route you want to explore, it is worth knowing it exists.