Hydra Liquid Black Dye | 250ml Treats up to 1063L - Concentrated Liquid Dye for Ponds, Water Features & Fountains | Pond Dye Keeps Water Safe for Wildlife

I have just added this to a new home made feature.. I added it a few drops 💦 at a time .. Bought a 250ml bottle and it still looks full so only needed a few drops for this 80 litre tub .. The next day I added a few more until I reached my desired colour .. Gorgeous Blue .. looks great .. Hopefully this will stop algae forming, only time will tell ... But I wanted to leave this review now ... Because I am so pleased with the appearance of the water .. This could stain the rocks if splashed on them but I bought blue/green rocks so I think it will be fine .. Bought dark grey stone to go round it .. ( be careful if you like pale or white stone as it may dye them ) ... Been wanting to do this project, since last summer .. Finally got all ingredients, and put this together at the weekend .. And the Blue Hydra Liquid Dye is Beautiful to look at ... 💦💧💦💧💦💧💦

Used in a half barrel water feature suffering from blanket weed which no product seemed to eradicate. No fish, some plants. So not only does the blackness of the water look better but the blanket weed and algae have disappeared. The black effect does slowly wears off, particularly with topping up evaporation. I found putting the dye in bit by bit until full blackout achieved worked OK and plants are doing well. Dropped a star as I think it is expensive for the amount that you get.

I was having having real problems preventing green algae growing in my water rower tank. I cleaned off as much algae as I could with magnets and a nylon chord during a water change and then used this dye. I wasn't expecting it to keep the algae away because you can't use chlorine tablets with any dye (just hoping to cover it up more than anything), but it's been around 3 months now and has been stored in direct sunlight and not only has there been no more algae coming back, the last signs of it sticking to the parts I couldn't clean has now completely disappeared and looks like new.

Wow - this is seriously good stuff! Great price - arrived within 24 hours - and so easy to use. Honestly you don't need much either to turn the pond water a beautiful blue ... we put one desert spoonful into our water feature and it's made a huge difference. Just one tip: wear gloves when handling the bottle/liquid, because it does stain!!We are delighted with it and will be ordering again. Thank you ... 💙💦💙💦💙

Used in a small garden water feature. Adds a nice colour to the reservoir coulour is not strong enough to colour fountain. Love the fact that it’s ok for fish and wildlife.

Very small bottle, was expecting it to be super concentrated but it’s not, have to use quite a bit of it to get the desired effect for my small fountain. Doesn’t last long. I don’t think I will buy again.

Used for a large water feature and it hasn’t stained the stones just added a nice effect to the water.Little pricey for a dye but does look good.

Bought this as the water in our water feature kept going green due to the sun and after a little research opted for this make.Quick delivery and after cleaning the water feature out and filling with clean water I then put the required amount in (which wasn't much) - the water became a nice fresh blue colour which lasted 4 months before the time came to turn off for the winter months.Makes the water feature look a lot better.

Très concentré et efficace !!!

Impressionante di come i liquido agisca rapidamente, e ne è bastato davvero pochissimo considerando che il laghetto misura sei metri per otto con una profondità di quaranta centimetri.Consiglio di tenere sempre attivi gli ossigenatori,e delle pompe di ripescaggio per far agire meglio il liquido e non stressare troppo i pesci.Sono molto soddisfatto.

ottimo prodotto, con poche gocce si ottiene un risultato eccellente.

Redonne un effet neuf du liner lorsqu'il est vieux. Utilisation possible même avec de l'eau chorée.

Nous sommes très satisfait de l’achat de ce produit le rendu est superbe ( à doser selon la capacité et le rendu souhaité) de plus il lutte très efficacement contre les algues verte ( depuis que nous l’avons mis plus aucunes algues ! Alors que nous avions utilisé des produits dit spécialisé avant qui ne fonctionnait pas comme celui-ci ! ) bref je recommande les yeux fermés !