How to Clean a Hot Tub, Step by Step

Why a deep clean matters

Daily sanitizer keeps water safe between cleans, but it cannot reach everywhere. Oils, lotion, and minerals build up in the pipes, the shell, and the filter over time, even in a tub that looks clean on the surface.

A full clean every three to four months (or sooner if you use the tub a lot) clears that buildup out. It also gives you a chance to check the shell, jets, and cover for wear before small problems grow into bigger repairs.

Plan for a few hours to do the whole job right. It is easiest to pick a dry day, since you will be working around hoses and an open tub for a while.

Step 1: Drain the water

Turn off power at the breaker before you touch any drain valve or hose. This protects the pump and heater from ever trying to run with no water around them.

Connect a garden hose to the drain valve and run the water to a spot where it will not pool near the house or flood a neighbor's yard. Many cities have rules about where spa water can drain, so check with your local utility if you are not sure.

A full drain usually takes one to two hours depending on the size of your spa. While it drains, this is a good time to pull the filters and start their soak.

Step 2: Flush the plumbing lines

Biofilm builds up inside the pipes even when the water looks clean. A line flush treatment, run through the system before you drain, breaks that film loose so it drains away instead of sitting in the lines.

Follow the product label for how much to use and how long to let it circulate. Skipping this step is the most common reason a freshly filled tub still looks hazy or foams within a week of a clean.

Run the jets while the flush product circulates so it reaches every line, not just the main plumbing.

Step 3: Clean the shell and jets

With the water out, wipe the shell with a cleaner made for hot tub acrylic. Regular household cleaners can leave a film that foams up once you refill, so skip anything from under the kitchen sink.

Use a soft brush or cloth around the jets to clear any mineral buildup, then rinse the whole shell with clean water before it dries. A dried residue is harder to remove the next time around.

While the shell is empty, take a minute to look it over for cracks, chips, or soft spots. Catching small shell damage early is much easier to deal with than waiting until it grows.

Step 4: Clean the filters and cover

Rinse filters with a hose first, then soak them in a filter cleaning solution for the time the label calls for. Rinse again before they go back in, since leftover cleaner can cause foam.

Wipe the underside of the cover and the seal with a mild cleaner. A clean seal keeps the cover doing its job: holding in heat and keeping debris, bugs, and pollen out of your water.

If your cover feels heavy, waterlogged, or will not stay up on its own anymore, it may be past its useful life. A worn cover lets in debris and heat loss, which makes every other part of water care harder.

• Rinse filters weekly, deep clean monthly
• Replace filters once they stop rinsing clean
• Check the cover seal for cracks or soft spots
• Replace a cover that feels heavy or will not hold its shape

Step 5: Refill and balance

Fill through the filter housing when your spa allows it, to cut down on air in the lines. Once full, run the jets a few minutes, then test the water and add sanitizer and balancers following the product label.

Give the water a day to circulate before you soak, then test again. Fresh water often needs more than one round of adjustment before it settles into the right range.

Write the fill date down somewhere you will see it, like a sticky note near the spa pack. That makes it easy to track when your next full clean is due.

A full clean is also a good time to check your supply of filters, test strips, and chemicals, so you are not caught short before the next one.

If you keep a running list of anything odd you noticed while cleaning, like a slow jet or a worn latch, it is easy to bring that list up next time our service team visits.