The Apollo Bio-Filter 1/2 Bio-Filter 1/2 with Valve Cap is a second-stage regulator from Apollo – the piece that delivers air to your mouth on demand. Balanced and responsive, it breathes effortlessly at depth, making every breath as easy as the last whether you’re cruising the reef at Sipadan’s UNESCO reef walls or hovering in the blue.
Technical Specifications
| Specification | Details |
| Brand | Apollo |
| Product | Bio-Filter 1/2 Bio-Filter 1/2 with Valve Cap |
| Stage | 2nd Stage |
| Type | Piston |
| Material | Chrome / Brass |
| Connection | DIN / Yoke |
| Best For | Recreational diving |
Key Features
- Balanced demand valve: Delivers air smoothly and effortlessly at any depth.
- Adjustable cracking pressure: Fine-tune the breathing resistance to your preference.
- Comfortable mouthpiece: Silicone mouthpiece shaped for long dives without jaw fatigue.
- Purge button: One-touch clearing keeps the regulator ready to breathe.
Suited for Malaysian Dive Sites
The Apollo Bio-Filter 1/2 Bio-Filter 1/2 with Valve Cap is built to perform across Malaysia’s best underwater destinations. Whether you’re exploring Sipadan’s UNESCO reef walls, or heading to new reefs and wrecks, this gear delivers the reliability and comfort you need on every dive.
Care & Maintenance
- Rinse after every dive.
- Purge a few times before and after each dive to flush sand.
- Replace the mouthpiece when it starts to harden or crack.
- Service alongside the first stage – they’re a system.
Final Verdict
Every breath underwater starts here. The Apollo Bio-Filter 1/2 Bio-Filter 1/2 with Valve Cap delivers smooth, effortless air at any depth – exactly what you want from a second stage.




Koh Wei Ming –
Used this bio-filter on my last dive trip to Bali. It worked well, though I did find the valve cap a bit stiff when changing out the cartridge. Otherwise, great product for cleaner breathing air.
Imran Hanafiah –
Thank you for your honest feedback, Koh Wei Ming. We appreciate your comment on the valve cap and will pass this along to our product team—pleased to know it enhanced your air quality during your dives.
Rachel Tan –
I’ve tried a few bio-filters before but the Apollo Bio-Filter 1/2 is definitely the easiest to attach and clean. After several dives in Tioman, I felt my air was noticeably fresher and my throat wasn’t irritated at all.
Imran Hanafiah –
Thank you for sharing your positive experience, Rachel. We’re glad the Apollo Bio-Filter 1/2 provided you with fresher air and greater comfort during your dives, and appreciate your feedback on the ease of use.
Syed Azlan –
Will this filter fit a standard Mares regulator hose? Want to make sure before buying. Thanks!
Junhao Lo –
Hi Syed, yes, the Apollo Bio-Filter 1/2 is designed to fit most standard regulator hoses, including Mares. If you need further compatibility assurance, please let us know your specific model and we’ll confirm for you.