Korallen-Zucht Biophos 2 Iron Based – 1000 ml

Biophos 2 is an iron-based granulate that removes phosphate from marine and freshwater tanks, absorbing up to 60g of phosphate per kilogram.

Iron based granulate for removal of phosphate in sea and fresh water tanks.

Slow water flow in a filter bypass. 1 kg can absorb approx. 60 gr. of phosphate. Biophos 2 should be exchanged as soon as PO4 is measurable at the PO4 reactor outlet.

To enforce the effect of the adsorber we recommend to place the wet adsorber overnight in the freezer. Recommended in any tank system. Rinse the adsorber with hot tap water before use.

Part of managing nitrate and phosphate levels — see our guide to Nitrate & Phosphate for why these two parameters are tracked together.

Compatibility

What it is. An iron-based phosphate adsorber. KZ's dosing guide: adsorption of phosphates, with a capacity of approximately 60 g of PO4 per kilogram of medium.

Where this sits in the Korallen-Zucht range. KZ build everything around four basis products — ZEOvit zeolite media, ZEObak, ZEOfood and ZEOstart — which together are the ZEOvit system. Everything else in the range, this product included, is a layer on top: colour products, problem solvers, and single elements. KZ's own guidance is that the products can each be used separately, without the complete ZEOvit system and without the other KZ products, but that the full effect in quality and colouration comes only from running the system.

KZ recommend running ZEOvit tanks without an additional phosphate adsorber. That is their own instruction, and it is the compatibility question that matters here: BioPhos 2 is for a tank that is not on ZEOvit, or for a specific phosphate problem, not a permanent addition to the system.

No ozone and no UV while you are running the ZEOvit system. That is KZ's instruction, and the reason is the point of the system: ozone and UV destroy the microorganisms and elements the whole method depends on.

KZ's own target water parameters, for any tank running their products: calcium 400–410 mg/L, magnesium 1,260–1,280 mg/L, carbonate hardness 6.5–8, potassium 380–400 mg/L, salinity 33–35 ppt. They add a warning worth repeating: higher figures bring no advantage. Neither growth nor colouration in SPS corals is improved by pushing past these, and higher levels tend to have negative effects.

Dosage & Directions

Korallen-Zucht's own dose. Exchange it according to the tank's nutrient load — as soon as phosphate starts climbing again, the medium is spent.

How and where it goes in. Wash it out properly with hot running water before use. KZ's instruction. Then run it passively in a filter mesh bag, or on a slow flow in a bypass filter. Iron-based media are aggressive if you push flow through them fast.

Start below the figure, not at it. KZ's own instruction for a first-time user, a lightly stocked tank, or a tank with little growth: reduce the dosage recommendation and adjust upward. Their words — do not act on the principle that the more the merrier.

Calculate on gross volume. KZ ask you to use the gross water amount for dosing arithmetic, not a net figure with rock and sand deducted.

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.

Backorder & Dispatch Timeline

This item is stocked to order. Back-orders are consolidated and placed with our overseas suppliers once a month, on the last day of the month, and all such orders are shipped before the 15th of the following month.

Back-orders cannot be cancelled once they have been placed with the supplier. If you cancel before that, payment-gateway charges of 2% plus GST are deducted and the balance refunded. In the rare case a supplier cannot fulfil the item, we will offer you an alternative first, and refund in full with no deduction if you would rather not take it.

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 72 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.