Most hotels find out about chlorine fastness the expensive way. The pool towels arrive in a crisp navy stripe, and by the end of the season they are blotched, streaked and fading towards pink. Nothing went wrong in the laundry. The towels were simply never specified for a life spent in chlorinated water and chlorine-bleach washes.
Pool and spa towels face two chlorine exposures: the pool water guests carry on their skin, and often a hypochlorite bleach in the wash. A towel that has not been built for both will lose its colour.
Why chlorine strips colour
Chlorine is an oxidiser. It attacks the chemical structure of many dyes and breaks them down, and the colour goes with them. How much a dye resists that attack is its chlorine fastness. Some dye types hold up well and some barely hold at all. The same blue can come from dyes with very different fastness, so two towels that look identical on delivery can age very differently.
White towels have their own version of the problem. Repeated bleaching can yellow or weaken cotton if the towel and the wash chemistry are not matched.
The tests to ask for
Colourfastness is measured to ISO 105 test methods and rated on a grey scale from 1 (poor) to 5 (excellent). For pool and spa towels, two are the ones that matter:
| Test | What it simulates | Why it matters |
|---|---|---|
| ISO 105-E03 | Colourfastness to chlorinated water (swimming-pool water) | Towels wet from guests leaving the pool |
| ISO 105-N01 | Colourfastness to bleaching with hypochlorite | Laundry routes that bleach |
| ISO 105-C06 | Colourfastness to domestic and commercial laundering | General wash performance |
Ask for results in writing, at a stated chlorine level, with a minimum grade agreed before production. Grade 4 or above is a reasonable target for coloured pool towels. A supplier who can only tell you the colour is "fast" has not tested it for your use.
Specify the dye, not just the colour
Most quality towelling is coloured with reactive dyes, which bond chemically with cotton and give good wash fastness. Chlorine fastness still varies within reactive dyes, so the specific dye selection matters for a pool line. Two practical routes:
- Yarn-dyed stripes on chlorine-fast dyes. The classic cabana stripe, woven from yarn dyed before weaving and chosen for chlorine resistance.
- White, or white with a dobby border. When fading is unacceptable and laundry runs a heavy bleach regime, the honest answer is often a white towel with a woven texture or border instead of colour.
Velour pool towels with a printed face need the same scrutiny. Ask how the print performs in chlorinated water, not only in a standard wash.
Construction for the pool deck
Chlorine is not the only demand on a pool towel. It is also wet more often, dried more often and dragged across loungers. Most of the general rules for durable towelling apply: combed, ring-spun cotton, dense pile and double-stitched hems. Pool towels are usually larger and slightly lighter than bath towels, so they dry faster between guests.
How to check before you commit
Before approving a pool towel programme:
- Ask for E03 and N01 results on the actual dye and shade you are ordering.
- Do a simple field test. Soak a sample in your pool water, dry it in the sun for a few days, and compare it with an unexposed piece.
- Run a sample through your own laundry with your normal chemistry.
A few days of testing costs very little. A season of faded stock costs a full replacement order.
What we run
Our pool towel programmes use yarn-dyed constructions on dyes selected for chlorine fastness, and we specify E03 and N01 grades on the quote for coloured lines. Where a property bleaches heavily, we will recommend a white or bordered towel instead of a colour that will not last. Our bath towel range can be matched in white across the rest of the property.
Tell us your pool chemistry and your laundry regime, and we will recommend a towel and dye route that holds its shade.
Frequently asked
- Why do pool towels fade so quickly?
- Chlorine is an oxidiser that breaks down many dyes. Pool towels meet it twice: in the chlorinated pool water guests carry on their skin, and often in hypochlorite bleach in the wash. Towels coloured with dyes of low chlorine fastness lose colour quickly, and the result is blotchy, streaky or pinkish fading.
- What test shows a towel is chlorine-resistant?
- ISO 105-E03 measures colourfastness to chlorinated swimming-pool water, and ISO 105-N01 measures colourfastness to hypochlorite bleaching. Results are graded from 1 (poor) to 5 (excellent). For coloured pool towels, ask for written results on the exact shade, with grade 4 or above as a target.
- Are white pool towels better than coloured ones?
- When the laundry bleaches heavily or fading is unacceptable, often yes. White towels avoid colour loss entirely, and a woven border or dobby stripe adds design without dye risk. Coloured pool towels work well when they are made from yarn dyed with chlorine-fast dyes and tested to E03 and N01.