Keeping a Hot Tub Running All Year in Southern Maryland

Pool season in Southern Maryland has an obvious start and end. Hot tub season doesn't. Many people use their spa hardest on a cold January night, when the air is freezing and the water is the best part of the day. That means a hot tub has to be ready all year, and it has to be cared for like a machine that's always on, because it is.

The good news is that keeping a spa running well is mostly a matter of regular habits. Here's what matters most.

Small water, big demands

A hot tub holds a small amount of water compared with a pool, and that water is warm. Both facts make it harder to manage. Small volumes change quickly: a few people soaking, a splash of lotion, or a bit of rain can shift the water balance noticeably. Warm water also makes bacteria and algae happier, and it uses up sanitizer faster than cool water does.

That's why spa water needs frequent attention. Testing regularly, adjusting as needed, and keeping the sanitizer where it belongs does most of the job. Many spa owners test every few days, and more often if the tub gets heavy use. A tub that sits unused for a while with no attention can slide out of balance quickly.

Filters do more than you think

A spa filter is usually a cartridge, and it catches body oils, lotions, hair, and small debris. When it clogs, water flow drops, the heater works harder, and the water gets cloudy and harder to sanitize.

Most spa makers suggest rinsing the cartridge on a regular schedule and giving it a deeper cleaning now and then. Cartridges also wear out. A filter that's flattened, torn, or never comes clean anymore needs replacing. A fresh cartridge is one of the cheaper ways to improve how a tub runs, and a tired one can cause problems that look like something else.

Draining and refilling

Even well-kept spa water doesn't last forever. Dissolved solids build up over time from sanitizers, body products, and tap water itself, until chemistry stops responding the way it should. At that point, the usual fix is to drain, clean, and refill. How often depends on how many people use the tub and how often, so use your owner's manual as a starting point rather than guessing.

A drain and refill is also a good time to check the shell, jets, and fittings for anything that looks worn, cracked, or slimy.

The cover matters more than most people expect

A hot tub cover keeps heat in, keeps debris out, and keeps people and pets from falling in. It also pays for itself in running costs, because a spa that holds heat doesn't need to reheat as often.

Covers don't last forever. Foam cores soak up water over time and get heavy, and a waterlogged cover insulates poorly. Hinges tear, vinyl cracks in the sun, and straps and locks wear out. Signs of a tired cover include sagging in the middle, a musty smell, a heavy feel when you lift it, and a tub that seems to be working harder to stay warm. A new cover is a repair some owners put off for too long, and the heating bill is where they usually notice.

Winter care

A running hot tub is mostly safe in winter because the heater keeps the water from freezing. The risk comes when something fails. A heater that stops, a power outage, or a pump problem can leave water sitting in lines during a hard freeze, and frozen plumbing in a spa cracks as easily as it does in a pool.

• Keep an eye on the display or temperature. If the tub is cooler than normal and not catching up, find out why before the next freeze.
• Make sure the cover is sealed and in good shape, since a loose cover loses heat quickly.
• Keep snow and ice clear of the equipment area and vents.
• If you plan to be away during a cold snap or the tub will be out of use, have someone knowledgeable show you the right way to shut it down instead of just switching it off.

Signs a hot tub needs service

Some things shouldn't wait. Water that stays cloudy no matter what you do, a heater that won't hold temperature, jets that sound rough or have weak pressure, a display showing error codes, a tripping breaker, or water leaking from the cabinet. Any of these can start small. A leak under a spa can go on for a long time before it's noticed, and it can rot the cabinet and flood the area underneath.

Hot tubs have electrical and heating components along with the plumbing, and that combination isn't a good one for guessing. If something is wrong, shut the tub off and call for help.

Moonlight Pool and Spa Service offers hot tub repair, maintenance, service, covers, and spa sales for residential customers in St. Mary's County, with the goal of keeping your spa operational all year long. See the Hot tub service page for the full list, or call (410) 610-8036.