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Hi Killli, Yes, get whatever is cheapest. Aquatic plants do not really care about balance. Cheers,

Hi, Osmocote will be fine if used under the substrate or deep in the basket if the plants are potted. It uses ammonium nitrate so if there are fish in the pond you should be careful with it's use. Cheers,

I agree with the above as rainwater reduces the GH/KH, which would matter much at all in any case. As sparkyweasel mentions we should always have a photo of the pond. If the water is stagnant some form of filtration and lots of plants, as mentioned will help oxygenate the water and provide...

Hi, Pea gravel will work, or any calcines clay product such as found in bonsai nurseries will work. Cheers,

This is not true at all. You're fooling yourself. You need to add more phosphate and definitely should avoid algecides. The....Matrix....has....you....Neo. The OP should continue to remove by hand the blanket weed and add copious amounts of non-ammonia containing fertilizer. Clean the filter...

Drat! Those were on a different server and the numbskulls went out of business. I've loaded as much as I can recall. May not be exactly the same ones, but close enough to get the general idea. Sorry. Cheers,

Yeah, that whole flocculation argument makes no sense to me. As mentioned, it's all about dwell time and intensity. The degree to which the destruction or inactivation of microorganisms occurs by UV radiation is directly related to the parameter "UV dose." The UV dosage is calculated as: D =...

Well, I guess the only way to tell is to take a sample of the green water and look at it under a microscope. As I said, after they are dead then they follow the rules of detritus. Whatever happens to regular dirt happens to them. Cheers,

Hi mate, Well, remember that when we say "free floating", this may not be accurate either. In fact, that phrase might actually be the source of the confusion. Check out this image. This is a Scanning Electron Microscope (SEM) image of a type of green water algae called Haematococcus...

Hi Martin, I think you're missing the point entirely. Free floating algae counts as germs. The UV radiation disrupts the DNA and RNA in exactly the same way as it disrupts the DNA/RNA of the free floating algae, and kills or sterilizes them in the same way. You never need to remove dead...

I don't know anything about building and constructing ponds. I'm not even sure what your problem is. I wasn't addressing your post at all. I was addressing Martin's post. If you say that in practice, location doesn't matter with regard to the UV unit, then I believe you. I never argued that...

Hmm, well, yes, the long and the short of it is that the clumping of microorganisms is not a valid explanation. There is no link between lethal dosage of UV and physical or mechanical clumping. Irradiating germs with UV does not initiate any mechanical merging of the germs. It either kills them...

This is not the mechanism by which UV disinfection occurs. UV has nothing to do with clumping and cannot affect pathogens in this manner. Disinfection occurs when the DNA and RNA molecules of the pathogen absorbs UV photons. The most effective frequency is in the neighborhood of 250...

Hi Steve, It either or both mate. :wink: Garden Direct do a trace powder as well as a potassium phosphate so just search for those on the site. I didn't have any fish so it was easy to use a standard all in one product like Miracle Grow which does contain NH4/Urea. As usual, these...

Steve, Check this out=>Garden Direct KNO3 Get the 25KG bag and you're set for years to come. :clap: They also do PO4 and traces for cheap. I would be shocked if there were any garden ferts that did not have NH4/urea. Gardens don't have to worry too much about toxicity and these N forms...

Hi Steve, Well a 3000L tank is about 75X bigger than the reference 20G, so you'd need about 5 teaspoons each of KH2PO4 and traces. You should have plenty of Nitrogen available from fish waste and food so I'd only dose about a third of the KNO3, which, to make it easy would be also...

The only algal species that are affected by a UV sterilizer is green water algae. The OP reports algae on rocks which will never be controlled by a UV. This is what everyone in the world focuses on and as a result they miss the big picture. If algae is a plant and is microsopic, does it not...

It doesn't matter how many plants you have if they are starving. If you don't want plants to take over then just prune them. Algae is not a function of how many plants you have. It is a function of how much light and nutrition you have. Cheers,

I've got a great idea; Why not just feed your pond plants? Then, when the plants are healthy your algae will go away. That way you don't have to kill anything. Cheers,

Hi Robin, Thanks for your comments. I think there is a disconnect though because my point was all about how someone who knows nothing of ponds simply applied the principles of EI on a pond that was suffering all sorts of algae problems and poor growth performance, and was able to...

Oooh...Oooh...(raises hand...raises hand :wave: ) The correct answer is....More weeds! :clap: :clap: Which unfortunately describes most ponds - even the ones I see at garden centers, while their proprietors rabidly try to remove NO3. Tsk..tsk..tsk... You're right though, it depends on the...

Some radical ideas in the thread; Little Shop of Horrors - How EI frightened the gardener Cheers,

Here's a barley straw study link I found while trolling through the Barr Report=> http://barleyworld.org/barleystraw/Barl ... 0Final.pdf There doesn't seem to be anything definitive in the study, but it appears to be a combination of things starting from the release of phenolic compounds such...

Yeah I've heard about the willow leaves as well. I'm not sure I would go so far as to say allelopathy but it could be that as the barley or willow decays some type of toxin is released which the green algae are particularly sensitive to. :wink: I had to chuck great quantities of barley that...

Hi Mick, Algae cannot be starved out. It's more likely that the growing plants shade the water, remove NH4 from the water column and feed/oxygenate the water for the bacteria. Green water is less of a nuisance than blanket algae which is persistent and is a tough customer. EI on a...

Ugh..duckweed can be brutal. The lily biomass removed was unreal. I split and re-split. It was easily 1/4 ton by the end of the season. As Tom pointed out I was way over the top with nutrient addition. I reckon if you get the lily going the pads will spread out and cover the duckweed. Cheers,

Hey Sam, I'd like the City of London to try EI on their portion of the Thames. It's way too brown for my liking! New mayor in town though. I don't think he'd want to pay the fert bill. :wink: Cheers,

Oh yeah, the heating cables. Forgot about those... :lol: :lol: :lol:

No, these people are plugged into The Matrix and will fight to the death to preserve the system. Pond enthusiasts believe in the nutrient-causes-algae myth even more fervently than do aquarium keepers. It's much more difficult in a pond because the lighting is unlimited and is uncontrolled but...

Well, yes, any of the terrestrial fertilizers can be used but I would only recommend their use in a pinch and then only on a well matured tank with lots of biomass. These are usually high in ammonia salts so you'd be playing with fire both from an algae standpoint as well as a toxicity...

Hi Angela, Welcome to the forum. :D I've had a look at the website for this product Aquaplancton and I couldn't find anything specific regarding it's contents. I could only find vague references to how "natural" it is and there seems to be some indication that it contains...

Very nice Denis. LOVE those shots, especially the first showing the scale of the pads. That could only have originated from somewhere in Amazonia. Thanks for sharing mate. 8) Cheers,

Well it's easy, or at least I take the easy way out. Dosing is simple as you just have to calculate the water volume and ratio up from the standard EI dosing schemes. You don't have to add CO2 because the pond plants are more emersed growth than submersed so once the leaves break the surface...

Hi, I'm not really a pond person but I moved into a house with a pond of about 1000 US gallons and it was a mess. Green water, green slime and huge quantities of what appeared to be hair algae infested the pond. The gardener, who had been "taking care" of this pond for a few years had...