Turnover rates, pressures and volumes, I think this topic can bring out some very good information for everyone.

Tell us here what is your turnover rate X and why you think it should be that.
As we know the norm is a turnover rate of 50% pond volume per hour, or pond volume every two hours

Pressure is a waste of money in my opinion as koi pond systems only require rather low pressure, but higher volumes.

Ai tog en ek is onder die indruk dis net water toets, water changes en jou visse is happy .Hoe bepal jy jou turnover rate is da n sekere formule wat gebriuk kan word .Deel maar die kennis sodat ek aan die werk kan spring

Hi Frans,
No turnover rate is rather important in many ways, I use to battle to get my water clean and by increasing the turnover rate attained sparkling water, just for one. It also has a lot to do with healthier water for your Koi.
what is wrong to me is to increase turnover rate by increasing pressure.

Neville,

How did you calculate; establishing that your turnover rate in your pond is +/- 50 minutes?

Quote:

I use to battle to get my water clean and by increasing the turnover rate attained sparkling water, just for one.

WoW! Really?

Thanks so long for the invormation. On the internet at www.fishdoc.co.uk/filtration/koi5flow.htm i
But it seems to be greek to me chek it out maybe it will make sence
for a simpler explenation

Hi Lee,

Yes you are correct in a lot of what you are saying, the most important being "balance" a pond has to have a balance.

The balance has to include the "2 hour" ratio.
The contact period with media issue has changed a bit since it was found that bacteria grows on the inside of pipe surfaces at full delivery. and the faster turnover will bring the water in contact more times per day. (hope I am making a correct statement here).

Lee, what I was trying to say was that if you don't remove the muck faster than your fish creates, your water won't be clean. Fortunately with sediment you can see this but what about the other stuff, when you see it it is in the form of ulcers or dead fish.

Now this thread is taking the correct direction thanks for your post

Yes Lee

Again what you say is what this thread is about, why do people say certain things. Have they measured it, do they now all the facts, no they don't. Therefore one uses a norm and then you make adjustments to that norm to suit your specific pond, until you have a balance, and you will soon realize when you reach that balance.

Remember this is my views and experiences in my pond, and not that of others. In dealer ponds for example you can only imagine how different their situation will be to our setups.

People tend to read pump graphs and then believe that, that is their pump volume but they have never looked at a pressure gauge, never calculated properly the friction losses. The pumps used by the koi keeper is normally very low pressure pumps and they run out of steam quickly.

Good observations for someone new to the hobby.

Bobby,

Quote:

Should I subtract 20% of the manufacturer turnover claims to compensate for height and bends, my pond turnover is once every 55 minutes.

How did you calculate that your pond turnover is once every 55 minutes?

By subtracting 20% is definitely not the right way!

Hi Bobby,

Nice to see you involved on this one

Quote:

Should I subtract 20% of the manufacturer turnover claims to compensate for height and bends, my pond turnover is once every 55 minutes.

Bobby this statement is one of the things I am trying to get at, it is a guess and I think one should try and avoid this, as this is measurable, one should physically measure the water that returns to your pond. And only then can you start making other adjustments. We cannot say exactly how much Bio or for that matter sediment filtration is needed. We have to adjust that but with pond circulation in consideration.
Not the ignorant statement I received earlier today that my veggie filter is a restriction and I cannot measure the water return there as it wont be the same as that which flows into my adjacent pond, now how the hell do you explain where the other water goes to.

This Thread is not about how I did things or try to proof me wrong sir or anyone else for that matter, it was posted to see the different turnover rates and why. If you care to listen next time when I try and explain, instead of swearing and shouting at me you might learn something I learned when I was a youngster.

Please remain within the intent of the thread

Keep on trying

Yes I agree that guesswork is involved but with the manufactures specs of 64000lt per hour on a 32000l pond I am pretty sure that my pond return will be under 60min. Luckily I do not use 50mm Toy R' Us BD pipes. To qualify this further the inlet water pipes is 110mm and the outlet pipes is 75mm and 90mm.

If I new how to measure the underwater 75mm pond returns and the x2 90mm gravity fed underwater returns I would do so. I can measure the x 4 overflow 32mm returns but it will serve no purpose. Well I am happy with the results and my fishies are happy with my foolish calculations.

Hello, my daughter is getting married on Saturday and after footing the bill this week, I have to keep the honeymoon going.