ogawa only

just double brick the wall , if your useing normal brick,s , and back fill inbetween !! or use concrte block's on there side , i can help you work out the cost of fibre glass just send me a pm with all the info

flipp

Thanks for your kind offer.
I'll send matron out with her measuring stick and send you the results

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Mostly harmless

nosmo

Regarding retaining wall thickness, the rule of 1/3 the height = thickness, therefore, if you go 3 ft high, to be on the safe side, make the first 9" at 1 1/2 blocks (13.5") .To make it perfect structurally, the steps in wall thickness should be on the outside but as it is only 3 ft, keep the wall flush on the outside, it looks better.

John

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Builder with a fishy thing

flipp

Thanks John,
I've pm'd Steve with a drawing of the existing pond and he's kindly offered to work out what I need.
I plan to have an inner block wall, an outer granite wall and fill the space between the walls with concrete. The inside will then be rendered to the same level as the existing render, then the complete interior fibre glassed.
Probably overkill but it'll look nicer and there wont be any risk of leaks where the new wall joins the old surface.

Just need to ensure matron has all the equipment she needs to complete the task

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Mostly harmless

nishikiboy

There is nothing to stop you having K1 in bags, I have 100 LITRES in bags on top of bags of Lithaqua in a chamber after a vortex, before the pump and then bead filter.
The secret is not to fill them too full then get 6 airstones in there to agitate it
I keep the bags away from the sides and outlet with a few Black Knight Brushes stood on end, trapped between the bags and the sides of the chamber, works fine.

Then, now and again, biologically clean with Kusuri Super C, or if feeling rich Environex.
Peter.

fatm410

Hi ALL

Can i ask amount of k1 are you using in that chamber, whats the size of the air pump and what amount of air stones do you have in that chamber.

Thanks Tom

koimaster

i would put try 50 ltrs with 75 ltrs per min of air doind in

nosmo

Here is the lost link !!!

Check the topics on the left--biological filtration--easy to understand and comprehensive.

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Builder with a fishy thing

eck321

hi looking for some help i am building a pond at this moment in time could i add some sort of filter before or after my box filter it is a xl mega box filter 900 gallon pond could i add ki after the box or a vortex before.
thanks. alex

koimaster

i would go vortex chap