Your shower filter still looks fine. No warning light, no drip, no sign. But the dry skin is creeping back, and that faint pool smell is too. Here's how often to change a shower filter, and how to tell when yours has quietly stopped working.
Change your shower filter cartridge every 3 months. After that, filter media loses strength and chlorine starts slipping back into your shower, even though nothing looks different. For the Tubo Go Shower Filter, a Replacement Shower Filter is $39, and if you subscribe, it ships automatically at 25% off with free shipping. The Tubo Pro Showerhead Filter runs on the same 3-month refill schedule.
Why do shower filters need changing at all?
A shower filter works like a sponge. The media inside grabs chlorine and metals as water passes through. Once it's used up, water flows through almost unfiltered.
That's the catch: a spent filter fails quietly. One morning your kid is scratching at their arms again. Your hair feels like straw. The bathroom smells like a public pool. And the cartridge was due for a swap weeks ago. For a quick refresher on what these filters remove in the first place, see do shower filters actually work?
Why every 3 months?
Shower water is the toughest job a filter gets: hot, fast and a lot of it. A standard showerhead runs about 2.5 gallons a minute, according to the EPA. A 10-minute shower is about 25 gallons, every person, every day.
All that hot water wears the media down. Hard water, sediment and high chlorine wear it down faster. Three months is the point where a cartridge is still at full strength, so that's when Tubo swaps it.
| Your household | What it means for the cartridge | Change it |
|---|---|---|
| Regular family use | Several showers a day, every day | Every 3 months |
| Hard water | Minerals make the media work harder | Every 3 months, right on schedule |
| Long, hot showers | More water through the media each day | Every 3 months. Subscribe so you never run late |
| A travel or guest shower | Less use, but the media still ages | Every 3 months. Same easy schedule |
Basic carbon cartridges
Hard water and heavy use wear them out fast.
Single-media filters
One material can only do one job, so they cover less.
Tubo cartridges ✓
Chlorine, fluoride and heavy metals out, with one simple rule for the Tubo Go and the Tubo Pro: a fresh cartridge every 3 months.
5 signs your shower filter is spent
“So good i love it 😍”
What happens if you don't change your shower filter?
You're back to showering in unfiltered water, while thinking you aren't. Your kid's skin is getting full-strength tap water anyway. The tight, itchy feeling after towel-off comes back, and so do the flare-ups.
An overdue cartridge can also slow your flow. A fresh one brings full pressure right back. If your Tubo Go has been in for 3 months, it's time for a fresh cartridge.
No shower filter yet? Start with the Tubo Go Shower Filter ($59), which keeps your showerhead, or the Tubo Pro Showerhead Filter ($95), a complete filtered head. Not sure which? Read showerhead filter vs inline shower filter.
How to change a Tubo shower filter cartridge
Filtering the bath too? Tubo bath filters run on the same 3-month rhythm. See how often to change a bath filter. Still choosing a shower filter? See the best shower filter for sensitive skin.
A new cartridge puts you right back to up to 99% of chlorine out and soft, calm skin after every shower. Subscribe for 25% off and free shipping, and never think about it again. Get your Tubo replacement filter →
Frequently asked questions
How often should you change a shower filter?
Every 3 months. After that, filter media loses strength and chlorine starts getting through again, even if the filter looks fine.
Can I clean and reuse a shower filter cartridge?
No. Rinsing might clear some sediment, but it won't restore the media that grabs chlorine. Once it's used up, it needs replacing.
Do I need to change my shower filter more often with hard water?
Every 3 months keeps your cartridge at full strength. If an overdue cartridge ever slows the flow, a fresh one brings full pressure right back.
Is it bad to use a shower filter past its date?
It's not dangerous, but it stops protecting you. Water flows through mostly unfiltered, and an overdue cartridge can slow the flow. A fresh one fixes both.
How much is a Tubo shower filter refill?
A Replacement Shower Filter for the Tubo Go is $39. Subscribe and it ships automatically every 3 months at 25% off with free shipping. Pause or cancel anytime.
Does the Tubo Pro Showerhead Filter need refills too?
Yes. Tubo Pro refills ship every 3 months, so the showerhead keeps removing up to 99% of chlorine, plus fluoride and heavy metals.
- US EPA WaterSense — Showerheads. epa.gov
- USDA Forest Service — Using Vitamin C to Neutralize Chlorine in Water Systems. fs.usda.gov
- CDC — Water disinfection with chlorine and chloramine. cdc.gov
- Drinking Water Inspectorate (UK) — Domestic water filters and softeners (maintenance and cartridge changes). dwi.gov.uk