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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-1Kg treats 10,000L £18.95
SAVE £4.50

RRP Price: £18.95

SAVE: £4.50


Free delivery on this item

Hydra Quartz-2x1Kg treats 20,000L £37.90
SAVE £10.45

RRP Price: £37.90

SAVE: £10.45


Free delivery on this item

Hydra Quartz-5Kg treats 50,000L £67.94
SAVE £13.99

RRP Price: £67.94

SAVE: £13.99


Free delivery on this item

Hydra Quartz-20Kg treats 200,000L £419.00
SAVE £249.05

RRP Price: £419.00

SAVE: £249.05


Free delivery on this item


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 Bryn Jarvis on Tuesday, 13 May 2014


I've recently drained, cleaned all the algae from the liner, filter, pump etc & refilled with app 50% of the water removed from the pond & 50% tap water. & reinstalled the goldfish, but from past experience the pond weed soon reappears. So would it be wise to install the treatment now, or wait 'till the blessed stuff shows itself again? Thank you.


  • Posted by Robin Newman on Tuesday, 13 May 2014

    Hydra Quartz removes blanket weed, if there is no weed in pond then product might not respond.
    Algae can re-appear anytime when there are favorable conditions. Apply Quartz as soon as blanket weed appears.
    You can try precautionary majors to stop blanket weed to re-appear such as do not feed fishes
    much, protect pond from sun light or else you can try our dyes for the pond which blocks
    sunlight and will control algae growth.
    For Dyes, Click here or Visit :

Posted by M carpenter on Monday, 5 May 2014


1700 ltr pond, how many mg's of hydra aqua pond treatment will I need ?


  • Posted by Robin Newman on Monday, 5 May 2014

    As per instructions, the dilution rate of Hydra quartz is 1:10000 i.e., 1kg treats 10,000 litres of water.

    So for 1700 litres you should use approx~170gm of the product.

    Here is the link for Pond volume calculator:

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.

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Customer Reviews

Throw off your blanket for the summer
it did just what it said on the carton. A fantastic result and the fish and pond insects did not object!
Review by Lorenzo
Very effective
Worked wonders on a pond full of Blanket weed and with green water. Used exactly as per instructions and no harm came to anything in the pond except the blanket weed.
Review by Antonio
Lily saver!
"Absolutely awesome.did the job with rid of all the infestation in a week. A bit expensive but did what it said on the tin"
Review by Noah
Used this product foe 2yrs now does what it says not like some other products just try it you will not be diapointed. Review by David
blanket weed
chose to use hydra quartz as other options had failed on my 5mtr by 16mtr natural spring pond. in the middle of april with water temperature steadily rising blanket weed was accumulating low in the marginals.barley straw bundles were used last time without any great success.with nothing to lose i gave hydra quartz a try by simply sprinkling by hand the treatment provided on the affected areas.i was surprised to see after about four hours the blanket weed had risen to the top of the pond.the following day on checking the progress of treatment i saw that the blanket weed had dropped to the bottom of the pond floor and had lost its natural vivid green looked as if it was in the second week of may i can report that the blanket weed is gone from sight but come the summer heat i shall have hydra quartz at the ready,just in case.
Review by Grayson
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