Hydor Quartz Bio Rings 450 gm

Quartz rings for fresh and marine water aquariums.

Hydor Bio-Rings for freshwater and saltwater aquariums are created through the high-temperature sintering of inert quartz. Thanks to the macro-porous structure, Hydor Bio-Rings is the perfect substrate for biological filters where the main goal of the hobbyist is the development and growth of bacteria colonies (aerobic and anaerobic) on the large surface area available (8.25 m2 per litre of Bio-Rings). Bio-Rings do not release phosphates, heavy metals, and does not change the pH of the aquarium.

CHARACTERISTICS

Specifications

• Material: inert quartz, sintered at high temperature
• Structure: macro-porous
• Surface area: 8.25 m² per litre of media
• Water: freshwater and marine
• Chemistry: releases no phosphates and no heavy metals; leaves pH unchanged
• Pack: 450 g

Two of those matter more than the rest. Releasing no phosphate rules out the commonest hidden source of algae in a tank that is otherwise clean: cheap ceramic media that leaches it. Leaving pH unchanged means it can go into a soft-water tank or a reef without pulling either way.

Note that Hydor give the surface area per litre of media while the pack is sold by weight, so the two figures cannot be converted into one another without knowing the bulk density, which Hydor do not publish.

Setup & Use

Where it goes. In the biological compartment of the filter. Hydor say it suits any filter with a biological stage, and that it shows what it can do in an external canister, where the flow and the oxygen carried with it reach the whole of the media bed.

Order it correctly. Biological media goes after the mechanical stage. Sponge and floss first to take the solids out; if the rings silt up, water goes round them instead of through them and the surface area stops counting.

What is actually happening in there. The macro-pores give both aerobic and anaerobic bacteria somewhere to live: the aerobic colony on and near the surface converting ammonia, the anaerobic one deeper inside where oxygen does not reach. That is the reason for a porous ring rather than a smooth one, and it is why the media takes weeks rather than days to reach full capacity.

Never rinse it under the tap. The whole value of this media is the bacterial colony on it, and chlorinated tap water kills that colony. Rinse it in water taken out of the aquarium, gently, and only when flow through the filter has actually dropped.

Replacing it. Hydor publish no replacement interval. If you do swap it out, do it in stages with weeks in between rather than all at once: changing the whole biological bed in one go takes the colony with it.

Freshness & Storage

Every batch we dispatch carries a minimum of 6 months’ remaining shelf life. Store this product in a cool, dry place away from direct sunlight, with the cap or inner foil closed tightly after each use.

Filter media and substrates carry no manufacturing or expiry date: their working life begins on first contact with water, not on the shelf.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number, or email us if you would rather, and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 48 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.