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Ona Block Lemongrass 170 g
European indoor growers handling persistent odours from a grow room, garage, workshop or storage area find in the ONA Block Lemongrass 170 g a compact passive solution that requires no electricity. This 170-gram gel block with lemongrass citrus aroma neutralises odour molecules chemically rather than masking them with stronger perfume. Lid adjustment controls intensity and directly impacts longevity — anywhere from 4 weeks at full opening to 3 months with a thin gap. No electricity, no recharge, no installation, no maintenance. Effective for spaces up to roughly 20 m³. Fast EU-wide shipping from our central Belgian warehouse with automatic tracking emailed at dispatch.
ONA Block Lemongrass 170 g — Compact Odour Neutraliser for European Growers
Indoor cultivation in any European context — apartments, terraced houses, home offices, dedicated grow rooms — produces odours that ventilation alone cannot fully eliminate. The ONA Block Lemongrass is a passive odour neutraliser that handles what extraction misses: residual smells in the surrounding space, leaks around tent zippers, and the inevitable scent release when opening a closed grow space. Available in our ONA odour neutraliser category alongside the full ONA product range.
How the ONA technology actually works
The block contains a gel matrix of essential oils that chemically neutralise odour molecules in the surrounding air. The reaction breaks down the odour molecule itself rather than overlaying a stronger fragrance — the result is the absence of the original smell, plus a discrete lemongrass citrus note from the carrier gel. For a more neutral, less aromatic profile, the ONA Block Polar Cristal is the standard alternative.
Operation and lid management
- Fully open lid: maximum neutralising power, block lasts 4 to 6 weeks.
- Half-open lid: moderate output, 8 to 10 weeks of effective use.
- Thin gap: low-level continuous maintenance, up to 3 months.
- No power required: works passively on temperature and natural airflow.
- Coverage: up to 20 m³ — one tent plus adjacent room, or a small garage.
Pairing with active filtration
The block is designed to work alongside, not instead of, carbon filtration. A quality Can-Lite 600 carbon filter handles the main exhaust stream from the tent. The ONA Block addresses what escapes — residual odours when opening the tent, leaks around zippers, and ambient odours in the room itself. To integrate the block into a ducting line, the ONA Block pipe 125 mm provides a clean inline connection.
Order the ONA Block Lemongrass 170 g today — fast EU-wide shipping from our Belgian warehouse, same-day dispatch on weekday orders before 4 PM.
How long does one ONA Block last?
Lifespan depends on lid opening. Fully open: 4-6 weeks of strong action. Half-open: 8-10 weeks of moderate output. Small gap for low-level maintenance: up to 3 months. Temperature and airflow influence consumption too — warm rooms exhaust faster than cool cellars.
Is Lemongrass stronger than other variants?
Neutralising chemistry is identical across all ONA Block variants — only the carrier aroma differs. Lemongrass gives a fresh citrus character, useful if you want to avoid sweet or floral tones. Polar Cristal is the most neutral option; Pro is the heavier-duty version for difficult environments.
Does an ONA Block replace a carbon filter?
No, they handle different parts of the same problem. Carbon filtration treats the active exhaust airflow leaving your space. The ONA Block neutralises residual odours in the surrounding room and during access events. For a fully odour-controlled setup, use both together.
How fast is shipping across Europe?
Orders placed on weekdays before 4 PM ship same-day from our Belgian warehouse. Delivery: 1-2 working days within Benelux, 2-4 days to France and Germany, 3-6 days to other European destinations. Tracking emailed automatically.
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