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Hydra Quartz (Pond Blanket Weed Treatment)

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Effectively removes string algae, blanket weed, and slime.
Perfectly safe for fish ponds, koi ponds, lakes, natural pools, irrigation systems and swimming pond....
Shelf Life of 3 Years
Name RRP Price Delivery Qty Add to Cart
Hydra Quartz 1 kg £18.95
SAVE £4.50

RRP Price: £18.95

SAVE: £4.50


Free delivery on this item

Hydra Quartz 2x1 kg £37.90
SAVE £10.45

RRP Price: £37.90

SAVE: £10.45


Free delivery on this item

Hydra Quartz 5 kg £67.94
SAVE £13.99

RRP Price: £67.94

SAVE: £13.99


Free delivery on this item

Hydra Quartz 20 kg £419.00
SAVE £249.05

RRP Price: £419.00

SAVE: £249.05


Free delivery on this item

*Price Includes VAT@20%

**Free Shipping on all Orders (UK Mainland Only)


Features & Advantages

  • Hydra Quartz granules are easy to apply and are broadcast or sprinkled directly over the blanket weed patch.
  • Works on the principle similar to traditional barley straw treatment but gives faster results. No need to deal with smelly, decomposed straw.
  • Absorbs nitrates and phosphates, which are the nutrients essential for blanketweed to thrive. Other constituents include favourable bacteria and enzymes that prevent blanket weed from returning.
  • No need to switch off the UV lights.
  •  Biological filters and pumps remain unaffected during treatment.
  • Natural and eco-friendly components of Hydra Quartz pose no danger to aquatic life including fish and water plants. Safe with pets, birds, and visiting animals that may drink treated water.
  • No harmful effect on concrete surfaces or synthetic liners.
  • No effect on the pH level of the water.


How To Use

Usage Rates

  • 1 kg  of Hydra Quartz treats 10,000 litres of water
  • 2x1 kg of Hydra Quartz treats 20,000 litres of water
  • 5 kg of Hydra Quartz treats 50,000 litres of water
  • 20 kg of Hydra Quartz treats 200,000 litres of water

Calculate the exact amount of product required to treat the water with the help of our pond and dose calculator

Full instructions on the label.

How does Hydra Quartz Work and How to Use:

  • Use Hydra Quartz with the first appearance of blanket weed.
  • Broadcast over the affected area.
  • Product may foam upon application, this is normal.
  • Ponds with fish should treat half of water surface at a time to give fish space to swim away from the dying blanket weed.
  • Hydra Quartz granules act instantly on the weed, which die off completely usually within 2-3 days after that remove the dead blanket weed from the pond.
  • Dead blanket weed, if not removed decomposes and will drop down to the bottom.
  • Waterfalls should be turned off before treatment. Apply Hydra Quartz on the ledges and leave for 30 minutes, brush over the surface. Running the waterfall after treatment washes away the weed. Treat the pond thereafter.
  • Special formulation of Hydra Quartz keeps the pond weed free for long intervals; however spores may easily travel back into the water body through wind, birds and new addition of water plants. Re-apply Hydra Quartz with the first sign of infestation.
  • Apply the product in full strength if re-growth is seen.



The Problem

Blanket weed is a widespread nuisance for most pond keepers. Characteristically blanket weed spreads in the form of long filaments and quickly covers the water surface with a woven filamentous growth.

Blanket weed grows fast under sunshine, especially in ornamental ponds with fish. Pond keepers over feed the fish causing additional nutrients (nitrates and ammonia) to leach into the ponds in the form of uneaten fish food and excessive fish excrement. If left unchecked, blanket weed may cause severe oxygen depletion in a water body along with creating stress for the larger fish by hindering their movement.

Pond keepers sometimes pull out the live blanket weed manually; this results in shedding of numerous spores within the water. The spores eventually grow and blanket weed returns in rather severe form covering even larger water surface.

The Solution

Hydra Quartz is proven as a highly effective treatment to get rid of blanketweed. Product constituents include natural minerals and sequestrants. Hydra Quartz starves the blanket weed by absorbing the nutrients on which the weed survives. The growth dies off normally within two to three days, after which it could be safely removed without the risk of releasing spores into the water.

Hydra Quartz is completely biodegradable and does not remain in the water for long but reverts to oxygen and hydrogen within 48 hours.

What is Blanket weed?

The term blanket weed is used to describe various strains of filamentous algae. Blanket weed may appear in a pond as fine wispy hair like growth on the sides of the ponds. Blanket weed may infest the pond as thick and candy floss looking mass floating freely on the water surface or choking the water plants. Similar to green water causing algae, blanket weed also spreads quickly in sun exposed ponds with nutrient rich water. Blanket weed are unsightly and may choke plants and fish.

Additional Information

Manufacturer's Suggested Retail Price No

Products Questions:

Posted by bob scutt on Tuesday, 25 March 2014


my blanket weed does not go across the top of the pond but clings to the side very thick and spreads along the bottom of the pond, do i just put the Hydra Quartz around the edge of the pool ?????


  • Posted by Simon Reid on Tuesday, 25 March 2014


    Yes, simply apply where ever the blanket weed is.

Posted by penny on Friday, 14 March 2014


can I use the blanketweed treatment & duckweed treatment together?


  • Posted by Simon Reid on Friday, 14 March 2014

    Yes, you can use the Blanket weed treatment (Hydra Quartz)& Duckweed Treatment(DR64T)

    1 people found this answer helpfull.
Posted by on Tuesday, 14 January 2014


I bought a bigger pack of Hydra Quartz, but the algae/weed disappeared with relatively smaller amount of the product. Would the remaining of Hydra Quartz work with similar efficiency later? What is the shelf life of the product?


  • Posted by Aj Edgar on Tuesday, 14 January 2014

    Store the remaining of your Hydra Quartz in closed container, above 5°C and use later whenever reapplication of the product is required. Hydra Quartz has a long shelf life of three years.

Posted by on Monday, 13 January 2014


Do you deliver outside UK? What are your policies regarding deliveries to Spain?


  • Posted by Aj Edgar on Monday, 13 January 2014

    Yes, our products are shipped worldwide. TO know more about our delivery policies for UK and other countries: Click Here

Posted by on Monday, 6 January 2014


How do I calculate the amount of product required for my pond?


  • Posted by Aj Edgar on Monday, 6 January 2014

    Hydra Quartz is applied according to the volume your pond. You can easily calculate the volume and the quantity of the product required by using following link.

    pond volume calculator

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Customer Reviews

blanket weed gone
I treated the blanket weed yesterday and within about an hour it was floating on top of the water plus leaves & debris from the bottom of the pond. I have been skimming the pond frequently since and I had only treated half! I don't think I shall need the other half. I' m very pleased with your product so far but there is some blanket weed still clinging to the edges. Review by M Scott
At last, something that works
We've suffered from blanket weed year in and year out in our small fish pond, and tried everything from straw bales to patent liquid 'cures' from the local garden centre. This year the weed was back with a vengeance even in February, so I tried Hydra Quartz. It took two 'doses' - things were obviously beginning to happen a few days after the first dose, but the weed seemed to be taking over again in defiance. A couple of days after the second dose the water was clear of blanket weed, though currently - just a few more days further on - it is a brownish colour but clear. It is a joy not to look down and see that thick green cotton wool everywhere - and instead, see the fish swimming happily around. I now have great hopes for a blanket weed free year - for the first time. Great stuff! Review by Michael
Does what it says on the tin,
Been using this for three years now, clears blanket weed in days just by sprinkling over the surface.Retreat every 6 weeks or so keeps it clear.Only thing I have ever used that works properly and I have tried almost everything else.A real miracle treatment.
Review by Keith Farrow
Blanket weed treatment
this product does exactly what it says it will do and dispatched the blanket weed in a matter of days, the only downside was that it did touch some Lilly leaves and burnt them
Review by chris jordan
Hydra Quartz Pond Clearer
WoW !!!! This product is really good. I've had bad blanket weed in my small pond for the last couple of years and have tried other products to no avail. This does what it say's and within 1 day I noticed a big big difference. After 3 day's it's even started to remove the sludge so the pond looks much clearer. It was so annoying pulling lengths of weed out every few day's but hopefully no more. The fish even seem happier (if that's possible) and it's nice to see them swimming around. Wish I'd tried this earlier. Thanks Hydra . Review by Mr. Colin
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