NT Labs Formaldehyde 250ml

NT Labs Formaldehyde 250ml

  • £8.50
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    NT Labs Formaldehyde 250ml

    Anti-Parasite Treatment for Koi

    Treats: White Spot, Trichodina, Costia, Chilodonella.

    When to use

    • When fish show symptoms of a parasitic infection, including white spots along the fins and body, flicking and rubbing, gasping at the surface, or an opaque film over the body.
    • Formaldehyde is highly effective at treating parasites due to its ability to penetrate through the mucus layer, reaching those parasites which would otherwise be protected from alternative bath treatments.
    • Formaldehyde can be used in conjunction with Koi Care Malachite to treat protozoan parasites more effectively.
    • Suitable for koi only.


    • Test your water quality using PondlabTest Kits.
    • Mix the appropriate dosage in a clean bucket of pond water, pour evenly over the surface of the pond and leave for 7 days. Switch off UV filtration for 5 days. Aerate the pond well during treatment.
    • If you feel a repeat dose is necessary, check your diagnosis carefully using the Diagnosis Tool on our website; a different medication may be more suitable. Allow 7 days and perform a partial water change before re- treating or treating with a different medication.
    • Always treat when you have time to observe fish and take appropriate action in the unlikely event of a bad reaction.
    • If required, mix with Malachite prior to adding to the pond, following the instructions above.


    • Do not use with orfe, rudd, tench or sturgeon/sterlet.
    • Do not use if the water temperature is above 30°C.
    • Do not use in hot, humid, thundery conditions.
    • Do not mix medications, other than combining with Koi Care Malachite.

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