Hot Tub Drainage and Refilling Basics

Why a hot tub needs a fresh start

Hot tub water is reused for many sessions, and every use brings in dirt, oils and whatever the users carry. Over time the water needs to be replaced. The maker of the tub states a schedule in the manual, and that schedule is the one to follow. Before buying, you can compare builds and bundles in the best hot tub guide.

The CDC explains that water used for swimming or soaking can spread illness if people swallow, touch or breathe in mist from contaminated water. The same pages recommend staying out of the water if you have diarrhea and showering before you get in. Those habits reduce what the water gathers between refills.

When you read a listing, the build and the extras are stated in the title. The drain process itself is almost never in the title, so the manual is the source for the procedure.

Reading a listing for drain and refill details

A hot tub title names the shape, the seat count, the build and sometimes the extras. Words like pump, hose, filter and cover can appear as part of a bundle. A pump in the title is useful for draining because it can move the water out faster than gravity alone.

Some listings name a bundle that includes a cover, steps, a filter or a repair kit. If a hose is listed, it is for connecting the drain valve. If the title says nothing about draining, that is not a sign either way; it simply means the detail is not stated by the seller.

For the exact drain valve location and the refill level, the maker's manual is the only reliable source. The listing gives the build and the bundle; it does not give the procedure. See the drain valve location and water refill source articles for the words to look for in a title.

Draining through a hose, step by step

The general method is the same for most tubs. Locate the drain valve on the side of the tub, attach a garden hose to it, open the valve and let gravity do the work. On a tub with a pump, the pump can push the water through the hose more quickly.

Read the maker's instructions before you start. The manual states whether the pump should run during draining and how to avoid air in the line. If the manual is missing, ask the seller for a copy.

Safety comes first. PoolSafely, the CPSC water safety campaign, says to keep children away from drains and suction outlets, especially in spas and shallow pools, and to never enter a pool or spa that has a loose, broken or missing drain cover. Keep the hose and the drain area clear of children while the tub drains.

Cleaning the interior and the cover

When the tub is empty, wipe the interior shell with a soft cloth and clean the cover with the same kind of gentle method. The maker's manual states which products are safe for the shell material; do not use anything the manual does not name.

The filter is part of the water system, and the manual states how to care for it. This article does not cover water chemistry or filter maintenance. For those questions, the maker's instructions and a licensed service professional are the right sources, and the official health pages below include general guidance for keeping water safe.

While the tub is empty, check the drain valve and the hose connection for anything loose. If a part needs replacement, the maker's parts list is the place to start.

Refilling the tub before the next use

Close the drain valve, put the filter back in place and fill the tub with a garden hose. The maker's manual states the correct water level; the listing does not state it, so do not guess from the seat count or the shape.

After the tub is filled, follow the maker's start-up steps for the heater and the pump. The listing may state that the heater is included; a plug-and-play tub is designed for a regular outlet, which matters when you plan the refill date. For a tub with a heater, see the best hot tub with heater guide.

Keep the manual with the box and the accessories. If you bought a bundle, the box contents list tells you what should be inside on delivery, including the drain hose if one is named. The fill and drain time article explains how titles state these details.

Keeping children safe around the tub

The Pool Safely campaign lists seven steps to reduce child drownings and entrapments in pools and spas: supervise children, teach them to swim, teach them to stay away from drains, make sure drain covers are compliant, install barriers and alarms, learn CPR and take the pledge. Supervising children is the first step: never leave a child unattended in or near water.

The CDC guidelines for healthy and safe swimming add that children are most at risk from swimming-related illnesses and that drowning is the leading cause of death for children aged 1 to 4. Draining and refilling is a moment when the drain is open, so supervision matters most then.

If you rent the property where the tub sits, ask the landlord about the local rules and about the drain location before you plan a refill.

When to ask a professional

This article explains the general steps. It does not cover wiring, ground preparation, water chemistry, sanitation, repairs or winterizing. For those topics, the maker's manual is the first source, and a licensed electrician or a licensed service professional is the right person for the specific questions.

Official pages from the CDC and the Pool and Hot Tub Alliance provide general guidance for healthy and safe water use. The CDC Legionella page notes that building owners and managers can use a water management program to help control germ growth in water systems; for a home tub, the maker's instructions serve the same purpose.

What to pick for your situation

Questions

How often should I drain and refill my hot tub?

The maker's manual states the schedule. The listing does not state it, and the frequency depends on the build and the number of users, so the manual is the source to read.

Can I drain an inflatable hot tub with a garden hose?

Most inflatable tubs have a drain valve on the side and often come with a hose adapter in the box. The title may name a pump; read the box contents to see what is included.

What should I check after refilling?

Check that the drain valve is closed, the filter is in place and the water is at the level the manual states. Then follow the maker's start-up steps for the heater.

Is a garden hose safe for filling?

A garden hose is the usual way to fill a hot tub. Follow the maker's instructions about the hose and about the water level, and ask the seller if the manual is not clear.

Should I ask a professional about water chemistry?

Yes. The maker's instructions and a licensed service professional are the right sources. The official health pages linked below give general guidance, and this article does not cover chemistry.

Who should I ask if I rent my home?

Ask the landlord about the tub and about local rules. Renting adds questions about the spot, the outlet and the drain location before you buy.