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Hydra Ammonia Lock (Remove Pond Ammonia)

Hydra Ammonia Lock (Remove Pond Ammonia)
 Hydra Ammonia Lock (Remove Pond Ammonia)Hydra Ammonia Lock (Remove Pond Ammonia) 
Our Price:  £24.75
List Price:  £31.67
Saving Of:  £6.92 (22%)
(Inc. 20% VAT)(£20.63 Exc. VAT)

For Pond/Fountain Water Volume Calculator Click Here

Brand:  HYDRA

  (4 Reviews)
  • Reduces Ammonia levels which are dangerous to fish
  • Rechargeable granules which boost nitrifying bacteria levels
  • Helps pond water to obtain natural balance
  • Shelf life 3 years, 1 kilo treats up to 1,350 litres


Features & Advantages

  • Ammonia Lock quickly adsorbs toxic ammonia and releases non-toxic sodium ions.
  • Ideal for pools, fountains and ponds with high fish load and freshly cleaned filters.
  • Allows sufficient time for the biological filters to develop and colonize with nitrifying bacteria in a new pond or at the beginning of the season.
  • Helps clear cloudy water due to bacterial blooms.
  • Helps filters to work efficiently during hot weather conditions.
  • Checks unwanted algal growth
  • Rechargeable crystals that can be used multiple times.
  • Consists of naturally occurring high grade Zeolites with micro porous crystalline constitution, not mixed with cheap impurities.
  • Secret of Japanese pond keepers.


The Problem

In ornamental garden ponds or pools the problem of excessive ammonia arises out of:

  • Overfeeding of fish and uneaten fish food in the water
  • Malfunctioning or inadequate biological filter system
  • More fish in the water body with insufficient filtration to handle the large amount of ammonia released in the water
  • Ponds with huge amount of waste (dead leaves/plants) decomposing at the bottom of the pond
  • Increased water temperature during particularly hot weather or at the seasonal beginning when fish activity rises while nitrifying bacteria are still not colonised in enough quantity.

With the increase of water temperature ammonia toxicity also rises, therefore same ammonia level during winters would prove harmful during summers when water temperature is higher.


Water Temperature (°C)


The figures indicate the maximum long term Ammonia level (in mg/litre) tolerated by healthy fish. Ammonia tolerance decreases with rise in pH and water temperature.


Ammonia Lock is a safe, fast and effective product that quickly lowers the dissolved ammonia levels in ponds, pools and all fresh water systems with fish.

Average Rating (4 Reviews):  
Write a Review and share your opinions!

Quick Acting
Wednesday, 15 May 2019  | 

My high ammonia levels were reduced 2 days after application.


4 of 4 people found this review helpful.

Brilliant value for money and excellent results
Saturday, 2 June 2018  | 

I bought this product to clear my pond water, I watched as it went from brown to a beautiful clear colour where I can see my fish again. What an incredible product.


6 of 6 people found this review helpful.

Fish pond cloud free
Friday, 11 May 2018  | 

I have a heavy fish load which has caused my pond water to go very cloudy. I have tried many treatments in powder, liquid and tablet form but nothing has worked. After finding this product, I followed the instructions on the tub and left it for a couple of days to be sighted with a lovely clear pond. I recharged the crystals in a bucket a week later and put back into my filter tank. This product really does work and I can see my happily swimming fish again.


7 of 7 people found this review helpful.

Reduced Pond Ammonia Levels
Thursday, 1 June 2017  | 

Checked my water parameters and the ammonia levels were very high, I put the granules into a net under the waterfall, where they would get the maximum water contact. The next day the ammonia level was dramatically reduced, I bought enough to have you lots on the go one being recharged with salt and the other in the pond. Within 5 days the parameters were back too normal.


12 of 12 people found this review helpful.