Seachem PhosBond (Bag)

• Removes phosphate and silicate together – the same dual-action media as loose PhosBond.
• Pre-bagged – no need to buy or fill a separate media bag before use.
• Fresh and saltwater safe – one product for either system.
• Reusable – can be dried and returned to service until exhausted, and doesn't leach phosphate or silicate back out.
• Two sizes – 250 g and 500 g, sold by weight rather than volume.

Seachem publishes PhosBond's dose rate by volume (60 mL per 200 L saltwater, or 60 mL per 400 L freshwater) rather than by weight, and we haven't been able to confirm an exact gram-to-millilitre conversion directly from Seachem for this pre-bagged pack. As a guide, the 500 g bag is roughly double the media of the 250 g bag – for a precise dose on a specific tank size, our loose Seachem PhosBond sizes (measured in mL) let you dose against Seachem's published volume-based rate directly, or ask our team and we'll help you match the bagged pack to your system.

Place the bag directly into a canister filter, media chamber, box filter, or the high-flow section of a trickle filter – no need to decant it into your own media bag first. Test phosphate after 4 days in place; if it hasn't dropped to around 0.02 mg/L, leave it running and test again in a few more days. Once levels are low and stable, the media can stay in place until they start climbing again.

• Suitable for: reef tanks and FOWLR systems fighting nuisance algae, freshwater tanks with excess phosphate, anyone who'd rather drop a ready-made bag straight in than fill their own.
• Not suitable for: precise dosing where you need to match Seachem's published mL-based rate exactly – for that, the loose PhosBond sizes give you a direct volume to work from.

The media can be removed, rinsed and dried between uses and returned to service until it's fully exhausted – it doesn't release what it's captured back into the water. Replace it once it stops bringing phosphate back down after a few days in place.

Covered by Seachem's standard quality guarantee at the time of sale, in addition to your rights under Australian Consumer Law. Ships as a standard parcel.

What's the difference between this and the loose PhosBond?

Same media, same job – this pack is already inside a media bag and sold by weight (250 g or 500 g) rather than volume, so there's nothing extra to buy or fill before using it.

How do I know how much to use for my tank size?

Seachem's published dose rate is by volume, not weight, so for a precise match to a specific tank size the loose mL-sized PhosBond is easier to dose exactly. For this bagged pack, treat 500 g as roughly double the 250 g bag and check with us if you want help sizing it to your system.

Can I use it in a freshwater tank?

Yes – PhosBond works in both freshwater and saltwater; the underlying dose rate is simply lower for freshwater than saltwater.

Do I need my own media bag as well?

No – this pack already comes bagged and ready to place into your filter.