What makes cold plunge water dirty
The water in a cold plunge tub stays still: nothing filters it and nothing renews it between sessions. Whatever gets in stays in. The first source is the person using it: sweat, dead skin, hair, traces of soap or lotion, dust picked up walking barefoot. The second comes from outside, especially when the tub sits in the backyard or on a balcony: leaves, grass clippings, pollen, insects, dust carried by the wind. Time does the rest. The longer the water sits still, the more likely it is to turn cloudy or start to smell.
The insulated lid does double duty here: it limits heat exchange and it keeps leaves and dust out of the water. The box also includes a thermal dust cover that goes on top. A tub kept covered between sessions collects far less debris than one left open under a tree. Location matters too: in the shade, away from a hedge that sheds its leaves, on level, stable ground that can carry about 730 lb of water, plus the weight of the person.
Good habits at every session
The most useful steps happen before you even get in the water. A quick shower, or at least a rinse of your feet and legs, removes the sweat, dust and sand picked up on the way to the tub. No lotion, oil, sunscreen or makeup: these products leave a greasy film on the surface and on the PVC inner wall, and a simple rinse will not remove it. Tying back long hair also keeps more of it out of the water.
After the session, pick out any visible leaves or hair by hand, then close the lid and put the cover on. That is also a safety rule: lid closed when the tub is not in use, empty it when no one is watching it, and never leave a child near it without an adult. The tub is not for children, and standing water is a drowning risk. Finally, look at and smell the water every time you open it: if it turns cloudy or smells, there is no point waiting for the scheduled change.
| When | What to do | What to watch for |
|---|---|---|
| Every session | Rinse off before you get in, no lotion, remove visible debris, close the lid and put the cover back on | How the water looks and smells when you open the tub |
| Every week | Wipe the waterline and the inside of the lid, check that the valve and the plug are fully closed | Signs of moisture at the base of the tub or around the tubes |
| Every 10 to 15 days | Drain through the hose or the bottom plug, rinse the tub, refill with fresh water | Change it sooner if the water turns cloudy or smells |
| Before storage | Empty, clean, air dry, remove the tubes, fold into the bag | No moisture left in the folds or the tube sleeves |
Water treatment products: read the label first
Products are sold to keep hot tub and bath water clean. The supplier's text for this tub does not mention any, and the information we have says nothing about how they get along with the PVC inner wall, the layer that touches your skin. This guide therefore cannot recommend one or give a dose. If you choose to use one, read its label and instructions: intended use, compatible materials, precautions, how long to wait before getting in. If the instructions say nothing about soft PVC tubs, skip it.
A product does not replace the basics. In a tub without filtration, the water always ends up carrying whatever goes into it, and the advice on the supplier's sheet stays the same: change it regularly. The simplest method, and the only one documented for this tub, comes down to four points: lid closed, a rinse before you get in, no lotion, fresh water every 10 to 15 days. And never mix two products together.
Changing the water and draining without flooding the floor
The tub has two ways to drain. The side hose, fitted with a 1/2 inch valve, carries the water wherever it can run off: the yard, a drain grate, a shower. The bottom plug is for when the tub sits over a floor drain. Either way, drain it outdoors, in a shower or over a drain, never onto hardwood, carpet or any floor that water can damage: 87 gallons escaping in the wrong place will flood a room in no time.
Above all, never tip the tub over while it is full to empty it. On this type of tub, public reviews report that the support tubes can slip when it is tilted, and the water weighs about 730 lb when the tub is full. Let the hose or the plug do the work, then sponge out the water left at the bottom. Take advantage of the empty tub to rinse it before you refill it.
- Check that the hose ends outdoors or over a drain.
- Open the valve, or pull the bottom plug, and let the water run out.
- Sponge out the water left at the bottom and rinse the wall.
- Close the valve or put the plug back before you refill.
Cleaning and drying the tub before folding it
Before you put it away, even for a few weeks, the tub must be empty, clean and dry. Rinse the inner wall with clean water and wipe the waterline, where residue settles, with a soft cloth or a non-abrasive sponge. For any cleaning product, the rule is the same as for the water: check its label to make sure it is suitable for PVC. Also clean the inside of the lid, the cover, the cushion (emptied of its water), the hose and the valve.
Drying is the step that matters most: the supplier's text says to dry the tub before folding it. Leave it open to the air, in the shade, until the wall, the tube sleeves and the folds are completely dry. Then remove the 6 support tubes, fold the tub and store everything in the zipped carry bag, along with the 2 repair patches and the seals. In winter, never let the water freeze in the tub.
Filters and ozone: gear for a different kind of tub
Filters and ozone units belong to cold plunge tubs that run with a chiller. A chiller is an electric appliance with a pump that cools and filters the water continuously. The tubs designed for this kind of unit are mostly larger, more rigid models of about 130 to 210 gallons, weighing about 35 to 42 lb empty. Because an electric appliance is then running close to the water, it needs a suitable electrical setup, which an electrician should check and approve before first use.
The tub in the kit has no filter, no water pump and no chiller, and it is not designed to take one. It stays light (8.4 lb empty) and folds away, but its water is neither filtered nor renewed automatically: upkeep relies on the habits described above, starting with changing the water. The Ice Bath Tub shop sells this foldable insulated tub with its lid as a complete kit (what's in the box: the tub and its 6 tubes, lid, dust cover, pump, cushion, drain, patches and carry bag), shipped free from stock in your region.
Frequently asked questions
Do you need a filter for a foldable cold plunge tub?
No, this type of tub is used without one. The tub in the kit has no filter or water pump and is not designed to take a chiller. Clean water therefore comes down to how you use it: lid closed, a rinse before you get in, no lotion, and fresh water every 10 to 15 days, as the supplier advises. If continuously filtered water matters to you, look at tubs built for a chiller instead.
Can you add Epsom salt to the water?
No. The supplier does not document how salt affects this tub's materials, including the PVC inner wall, the valve and the seals. Without that information, it is better to add nothing and keep clear water that you change regularly. The same caution applies to bath salts, oils and any other additive.
Why does my ice bath water smell bad?
Most often because it has sat too long or picked up residue: sweat, lotion, leaves, dust, especially if the tub was left open. Water that smells should be changed right away, without waiting the 10 to 15 days: drain it through the hose or the plug, rinse and wipe the wall, then refill with fresh water and keep the lid closed.
