At Casa y Deco, we love it when our readers decide to indulge themselves by installing a jacuzzi on their terrace or in the garden. It’s one of those luxuries that seem unattainable until you realise that, if managed well, it is completely realistic. But here’s what no one tells you in stores: the maintenance of these hot water pools is more demanding than it seems at first glance. It’s not impossible, but it requires consistency and a bit of know-how.
If there’s one thing we’ve learned at Casa y Deco, it’s that buying a jacuzzi is like bringing home a baby that needs regular attention. Many people end up abandoning it after the first season because, quite simply, no one explained to them what maintaining it really involves. The good news is that with a clear routine, it’s not complicated, and the results —guaranteed relaxation— are absolutely worth it.
The balance of the water is the foundation of everything. The first thing you need to understand is that a jacuzzi is not a normal pool: the hot water, constant recirculation, and the reduced number of litres create an environment where problems grow quickly. The pH must be maintained between 7.2 and 7.8 for chlorine to work properly and for users not to suffer irritations. If it falls below this range, the water becomes acidic and corrodes the equipment; if it rises, chlorine becomes ineffective and algae appear.
You should measure the pH with a test kit at least once a week. I confess that at first, this seemed tedious to us, but once we understood that it takes five minutes every seven days, it became routine. Current digital test kits are so easy that there’s no excuse: you insert the strip, wait ten seconds, and you’re done. If the pH is out of range, you adjust it with pH increaser or decreaser as needed. These products are inexpensive and come with clear dosing instructions.
Disinfection with chlorine is non-negotiable. Although there’s a myth about chemical-free jacuzzis, the reality is that chlorine (or bromine, its alternative) is practically mandatory. Water heated between 37 and 40 degrees is a paradise for bacteria and fungi, so you need a disinfectant that works constantly. Chlorine dissipates quickly in jacuzzis because the heat consumes it much faster than in cold pools. Keep the free chlorine level between 2 and 4 ppm (parts per million).
The ideal is to use slow-dissolving chlorine in tablet form, which releases chlorine gradually. This way, you won’t have sharp spikes or drops. Some manufacturers recommend automatic dosers that regulate chlorine based on pH and disinfectant sensors. Yes, it costs more money upfront, but the long-term savings are real because it optimises consumption and manual maintenance.
Filters need frequent cleaning. The filtration system of a jacuzzi is much smaller than that of a pool, so it gets dirty much faster. You should check the filter pressure every two weeks. When it rises above the normal operating pressure (which manufacturers indicate), it’s time to clean it. A dirty filter reduces water circulation and prevents chemicals from distributing properly.
There are two types of cleaning: backwashing, which reverses the water flow to dislodge dirt, and deep chemical cleaning, which you do two or three times a year by disassembling the cartridge and soaking it in a specific cleaning solution. Never use a garden hose with direct pressure: it destroys the filtering material. Most manufacturers sell cleaning kits that include the solutions and instructions.
Buffer alkalinity is your invisible ally. Many beginners only look at pH, but buffer alkalinity is what stabilises that pH so it doesn’t fluctuate constantly. It should be between 80 and 120 ppm. If it’s low, the pH will bounce back and forth, and you’ll use a lot of chemicals. If it’s high, the pH rises significantly and is hard to lower. Good maintenance starts with checking and adjusting alkalinity first, then pH, and finally disinfectant.
At Casa y Deco, we’ve seen many cases where people spent a fortune on chlorine and pH adjusters without understanding that the problem was alkalinity. Once you fix that, everything flows.
Water changes are more frequent than in pools. It’s not that you have to empty the jacuzzi every week, but the renewal cycle is more intense. While a standard pool changes water every 2-3 years, a well-maintained jacuzzi should be completely emptied every 3-4 months, or at least do a partial drain of 25-30% each month. This is because dirt, bacteria, and bodily residues accumulate faster in smaller volumes and higher temperatures.
The procedure is simple: close the recirculation system, open the drain valve (which leads to a part of the garden where the water won’t harm anything), and let it flow out. Then fill it with fresh water. Take the opportunity to clean the interior walls with a soft brush while it’s empty. Don’t use chlorine to clean the surfaces while the jacuzzi is in operation. Always empty, clean, rinse, and then refill.
The cover is your best maintenance investment. It’s not a luxury; it’s practically mandatory. A quality thermal cover prevents heat loss (reducing electricity consumption), keeps leaves and dirt out, and stops bacteria from multiplying when you’re not using the jacuzzi. There are rigid and flexible covers. Rigid ones are more expensive but last longer and provide better insulation. Flexible ones are economical and sufficient if you have a garden protected from the wind. Always use it when you’re not using the jacuzzi, even between sessions.
Cleaning the water lines and jets is routine. Where the water touches the inner edge of the jacuzzi, especially around the jets, a film of dirt and algae accumulates. Every time you’re about to use it, take five minutes to wipe that line with a soft sponge. Don’t use abrasive products that scratch the surfaces: most jacuzzis have acrylic or fibreglass finishes that are delicate.
The jets can also become clogged with mineral deposits if your water is hard. If you notice that some jets are weaker, there are specific jet cleaners (based on citrate) that dissolve those deposits without damaging the pipes. Use them once or twice a year as preventive maintenance.
Regularly check accessories and electronics. Pumps, heaters, and control panels are expensive components that degrade if you don’t pay attention to them. The heater should be checked before each season: make sure it heats to the desired temperature without fluctuations. If it takes much longer than normal, there may be scale buildup in the ducts.
The electrical cables and connections should be dry and protected from constant splashes. If you see rust or corrosion, it’s time to clean with a mixture of water and mild vinegar, or directly call a specialised technician. Don’t improvise with electricity and water: it’s not worth it.
The annual maintenance cost of an outdoor jacuzzi ranges from chemical purchases, filter changes, and electricity. It’s not trivial, but it’s not astronomical either. The important thing is not to neglect it for months because then the recovery cost is much higher. Weekly consistency is infinitely cheaper than trying to recover an abandoned jacuzzi. If you assume it’s like watering plants or cleaning the kitchen —a regular household task— it fits perfectly into your routine. And believe me, when you immerse yourself in 38-degree water after a long day, it will justify every minute spent maintaining it.
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