Pond Block

Algae control: 1 block per 1,000 liters of water

Very easily make your pond within 10 days (wire) algae free using the Pond Block. The block ensures that the algae in your pond die and you get a clear pond again.
Use 1 block per 1,000 liters of water. For best results combine with Bacta Clear (pond bacteria). Pond Block removes algae, Bacta Clear prevents them and ensures better growth of aquatic plants.


Excl. € 4.95 shipping costs

Organically grown
GoGreen Shipping
Sustainably Certified
Recycled Packaging
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  • Free shipping from € 50,-
  • Determine the sending date
  • Fast delivery, within 2 business days in house
  • Delivered from own nursery
  • 100% growth and flowering guarantee


Pond Block consists of a biological binder that dissolves very gradually in your pond. When the algae come into contact with the released substance, they will die and sink to the bottom. This will make the water clear again. The complete dissolving of your Pond Block takes several months, so the active ingredients slowly and dosed end up in your pond water. Evaporation of your pond water and/or rainfall does not reduce the effect of the Pond Block. As algae grow throughout the year, the Pond Block can also be used in winter. For clearing the dead algae on the bottom you can use Pond Clear-Zyme blocks.

Pond Block is not harmful to humans, plants and animals.


  • Use 1 Pond Block per 1000 liters of water.
  • For smaller ponds of less than 1,000 gallons, use on a pro rata basis (e.g. ½ Pond Block to 500 gallons of water);
  • A precise dosage is important for the best result. The Pond Blocks are best spread out in the water, in small ponds in the middle;
  • Do not place the Pond Blocks in the deepest part of the pond, due to the lower water temperature there will be less algae growth there;
  • Preferably do not place near a pump or fountain.
  • Pond Block is good to use in combination with Pond Clear-Zyme blocks (pond bacteria).
  • If stored dry can remain good for years
  • Additional Information

    Weight 0,1 g
    Dimensions 4 × 3 × 2 cm

    What are the shipping costs
    Country Shipping costs
    Netherlands € 4,95
    Belgium € 9,95
    Luxembourg € 9,95
    Germany € 9,95
    Austria € 19,95
    France € 29,95
    Spain € 29,95
    Italy € 29,95
    United Kingdom (UK) X

    From € 50, - shipping costs are FREE for the Netherlands, Belgium, Luxembourg and Germany

    From € 75, - FREE shipping for Austria

    From € 100, - FREE shipping for France, Spain and Italy

    When will I receive my order?

    The average delivery time is 1 to 2 business days, if the items are in stock. Articles that are not in stock take a little longer to deliver. We do everything we can to meet the promised delivery time. If this is unexpectedly not possible, we will inform you. After your order you will receive a track & trace code. Keep an eye on this code for the most current information.

    By whom will the delivery be carried out?

    We work together with the delivery service DHL. As soon as your order leaves our house, you will receive a track and trace code so you can follow your package. The DHL will attempt to deliver the parcel on the specified dispatch date. You are not at home? Then the deliveryman will try to deliver the parcel at the neighbours. If this also fails, the parcel is taken to the nearest DHL service point. Here it will stay for 5 days for you to pick it up. DHL will always leave a note behind with instructions. Also via the track & trace code you can see where you can pick up the package.

    How can I track my order?

    After placing your order you will receive a track & trace code (DHL). Through this code you can find the most current status of your order.

    For more information or questions use the support button on the right side

    How can I pay?

    Whatever payment method you choose, you always pay safely.

    • iDEAL: for anyone with a Dutch bank card.
    • Credit card: the amount is reserved and not debited until the item is delivered.
    • PayPal: secure online payment through your own PayPal account.
    • Bancontact / Mister Cash: online payment method via your own internet banking environment.
    • Klarna: pay your order only after you have received the item.
    Where can I find my invoice?

    After your order you will receive an invoice by e-mail.

    We also store your invoice online in your account. This way you can easily consult and print your invoices as often as you like.

    Will I receive an invoice with my order?

    No, we never send an invoice with the order itself. So if the order is a gift, feel free to send it directly to the recipient. The invoice will be sent to the e-mail address we have on record.

    For more information or questions use the support button on the right side

    Do I have a guarantee on my plants?

    Our plants are grown with the utmost care. Special attention is paid to the development and growth of the plant. When packing your order, a quality control also takes place. So you can be sure that the plants you buy from us are in perfect health.

    Have you received plants and are you not sure of the quality? Let us know within 48 hours after delivery, using this form. Please include a photo so we can take a look and advise you. If it turns out that the plants are really not of good quality, we will of course give you a guarantee on your purchase.

    Other articles

    For all other (non-living) items you buy from us, the legal warranty applies. Legal guarantee means that a product is or should be what the consumer may reasonably expect from it. For some products there is also a manufacturer's warranty.

    How long is the warranty valid?

    If it appears that you are entitled to the growth and bloom guarantee it is valid for 1 year from the date of purchase.

    What is my warranty certificate?

    Your invoice or proof of purchase is also your guarantee certificate. You can save your invoice in your account. That way you will never lose it again. Handy, right?

    For more information or questions use the support button on the right side

    CSR: Corporate Social Responsibility

    Van der Velde Waterplanten strives to achieve the 17 global goals. We believe that together we can make a difference. Cooperation is essential for progress. We are committed to helping people distanced from the labour market. We spare the environment by not using chemical pesticides, if necessary we use biological control. Plastic is avoided and recycled as much as possible. By following the developments in the field of packaging we have an increasing percentage of biodegradable packaging available.

    Sustainable MPS certified

    Acting honestly and openly, ensuring transparency, reliability and clarity. Ensuring a healthier and better world. This is what Van der Velde Waterplanten stands for. We would like to underline this with the MPS-Florimarkt TraceCert and Global G.A.P. GGN Floriculture certification we have obtained.

    Organic cultivation

    All of our plants are organically fertilized at the nursery and grown without pesticides. After this the plants are put into rest (hibernation). This means that the plants only start their growth process when they are placed in the pond.

    FSC paper and recycled plastic

    We strive to produce our products and packaging as co2 neutral as possible. We use PLA and PET plastic packaging and FSC certified paper.

    GoGreen Climate Neutral Shipping

    Through our partner DHL, we ship all our packages under the so-called GoGreen Climate Neutral service. With this service, DHL calculates the CO2 emissions per shipment and compensates them by investing in environmentally friendly projects.

    For more information or questions use the support button on the right side