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  1. I'd agree that soil pipe is more than adequate...

    I'd agree that soil pipe is more than adequate for the pressures involved if there won't be any ground movement but, sorry to say, a 10 metre head isn't 14.6 bar (14.6 atmospheres) its a little under...
  2. Ignore them - anyone who says that hasn't grasped...

    Ignore them - anyone who says that hasn't grasped the basics of hydrostatic water pressure.

    The hydrostatic pressure of water increases by 0.41 psi for every foot depth so even a 6 foot deep pond...
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    Selina, Adding sodium bicarbonate won't lower...

    Selina,

    Adding sodium bicarbonate won't lower the pH, it will raise it but raising the KH and, therefore, raising the pH will make any ammonia more toxic. Except in the case of a pH crash when...
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    The minimum depth for a koi pond is 1.2 m (4 ft)...

    The minimum depth for a koi pond is 1.2 m (4 ft) and aeration should be at, or near, the full depth. I don't see any particular advantage going deeper than 1.8 m (6 ft) but, if a pond depth is...
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    I'm afraid so. Calcium carbonate is virtually...

    I'm afraid so. Calcium carbonate is virtually insoluble in water unless the pH falls below 7 or it has significant levels of dissolved carbon dioxide due to poor aeration. Your pH is well above 7...
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    None whatsoever. Bacillus Thuringiensis...

    None whatsoever. Bacillus Thuringiensis Israelensis (Bti) bacteria form spores which have internal crystals which are toxic to the larval stages of many insects including aquatic larvae. When the...
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    Yep, sorry to say, Sammy, you've been...

    Yep, sorry to say, Sammy, you've been misinformed. Calcium carbonate will dissolve in water where the pH has already crashed to a low value but, if shells (which are mainly calcium carbonate)...
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    For anyone who would like to show off at club...

    For anyone who would like to show off at club meetings or down the pub with their koi mates, Mosquito Dunks have an active ingredient which is a species of bacteria (Bacillus Thuringiensis...
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    Mike warns about aeration in deep ponds because...

    Mike warns about aeration in deep ponds because that will cause problems. The reason is that, if the aeration is too deep, there is a risk that the pond can become supersaturated with air which...
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    Tell me more about what happened. What was the...

    Tell me more about what happened.

    What was the behaviour of the affected fish?
    Who diagnosed what was causing this behaviour and how did they come to that conclusion?
    When you say the condition...
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    Yes, I'm sure that no nitrogen is produced by...

    Yes, I'm sure that no nitrogen is produced by aerobic biofiltration.

    A very small amount of dinitrogen (nitrogen gas) is the end product of anaerobic biofiltration if you use a denitrifying media...
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    Hydrogen Sulphide (I use the English spelling -...

    Hydrogen Sulphide (I use the English spelling - AKA Hydrogen Sulfide) is produced by anaerobic bacteria, deep in build ups of rotting organic silt, which ferment sulphur in the organic debris as part...
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    Yes, the arrangement will be very much less...

    Yes, the arrangement will be very much less efficient because the heat pump, not only can't recover all the heat that cooling the room air made the pond lose but, if you factor in the electricity...
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    Stuart, Im sorry to say that your assumptions...

    Stuart,

    Im sorry to say that your assumptions of the advantages you expect are completely ruled out by the Laws of Thermodynamics. These are far too complex to quote so I summed up the First and...
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    Stuart, in the time I ran my company, I must have...

    Stuart, in the time I ran my company, I must have seen just about every possible combination of how people have installed air source heat pumps with the idea of gaining some kind of advantage from an...
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    Air source heat pumps pump huge quantities of air...

    Air source heat pumps pump huge quantities of air through themselves so, if the heat pump is in an enclosed space, it will remove the warm air very quickly, extract the heat from it and replace it...
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    One cup per 1,000 gallons would certainly raise...

    One cup per 1,000 gallons would certainly raise the KH, and therefore the pH, but it's far too much to add at any one time because the koi will be stressed by the resultant sudden change.

    Except...
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    Just a point of clarification; not all heat pumps...

    Just a point of clarification; not all heat pumps have a deicing feature so ice will continue to build on those that haven't until the inflow heat exchanger is damaged. I've seen units with solid...
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    Simple answer "yes". Longer answer yes,...

    Simple answer "yes".

    Longer answer yes, because the heat pump takes so much heat out of the air that it cools damp air below the point at which the water in it will freeze. The build up of ice...
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    TDS is a value that is useful to know but can...

    TDS is a value that is useful to know but can vary wildly from pond to pond. There isn't an optimum value, its just an indication of what is dissolved in that water. Some will argue that because...
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    Sorry but that gives concentrations in US gallons...

    Sorry but that gives concentrations in US gallons so you would have to multiply the quantities by 1.2 to find the amount to add to get the same concentration in Imperial gallons or use the one on the...
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    Sorry about that Johnathan, I would have replied...

    Sorry about that Johnathan, I would have replied earlier but I didn't see this thread until it came up as a new post when I logged in this morning.
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    Johnathan If it has an arrow on it there must...

    Johnathan

    If it has an arrow on it there must be a reason so the simple solution is to fit the heater upside down.
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    Excuse the rush - got to go out. Here's how to...

    Excuse the rush - got to go out. Here's how to mature media in a bin or in a pond that has no fish in it just using the volume of water in the biochamber. If the pond is unheated, you will be best...
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    Yep, missed it at the first look but sussed it...

    Yep, missed it at the first look but sussed it when I looked properly. Let's not say what it is so we can annoy those who don't spot it :rolleyes: :confused:
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