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  1. #1

    Submersible or dry pump???

    Hi all,

    I'm extending my pond in spring and upgrading....at the moment there's no bd etc and I'm running pump fed but want to future proof it. I've asked questions here and watched millions of videos and cross referenced millions of ideas and suggestions. So - I aim to go gravity fed, into a cycling vortex with added stuff, into a secondary, then into wetland. Meanwhile, there'll be a skimmer and waterfall. This replaces pump fed pressure and box filters.

    A few questions though:

    1. I have perfectly good solid handling submersible pumps. If I put one into a third chamber, to pump from vortex to wetland, would that work? I know I'd have to make sure the chamber was deep enough to handle flow rate without drying out, but in principle? I'd planned on putting the second into the skimmer then to waterfall.

    2. How important is variflow? Will I be alright if my pond size calculations roughly match the pumps ability? Is there any draw back to over sized pumps?

    3. Do gravity fed ponds need to be raised? To people height? Or can they be in floor with digging down to sort out filters?

    4. Will the filters still need to be water level even if they're draining into wetland?

    5. Is depth or width the key factor for an effective vortex filter?



  2. #2
    Senior Member Rank = Supreme Champion Ajm's Avatar
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    In gravity set ups they can be ground level not a problem along as the filters are the same water level hight . ( laser levels all the way )

    A pump in the last chamber will work but these vari flow pumps save a bomb when It comes to running costs . I swopped pumps out a while back and going from fixed speed pump to vari flow saved 100 Watts then over winter I have dropped the flow rate further giving me even more saving !!!

    If you have your filters at the wrong hight they will not work or over flow

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  3. #3
    Cheers for that! It's not going to be the biggest pond in the world and I'm currently swatting up on velocity rates etc, the run to filters will be pretty short too. With that in mind and with the added factor of a skimmer I'm trying to figure out my best sized pipe options. The submersibles I have are 9000 and 8000 lph

  4. #4
    So is the idea that you adjust the flow rate to optimum or has the vari flow got another function?

  5. #5
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    I'd second going for variflow pumps.

    They allow you to control how much water goes through the filters. Which is handy in a variety of situations e.g. when treating for parasites, overwintering the pond, heavy feeding in summer, pollen/blossom landing in the pond, if you need to reduce your running costs etc...

    The alternative is you guess what size pump you need and then immediately regret buying the pump as it's either too much or too little flow, or it's just annoying that you can't change the flow through your filters... and eventually buy a vari pump you can control the flow on.

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  7. #6
    Great stuff thanks. Does that go for
    Skimmer/ biofalls too do you reckon?

  8. #7
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    I'd say it applies to skimmers too.

    Unless you already have some pumps you can play around with to guage what power pump you need, it's hard to predict whether a skimmer will have enough draw.

    Although as I have a drum, and the bottom drain and skimmer both feed into the drum, I use ball valves to control the flow on my skimmer. But if you are going for a dedicated pump, then a vari pump will allow to you get the optimum draw.

    I don't know what a biofall is so can't comment on that.

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  10. #8
    Thanks! A biofall is another new discovery to me, its essentially a waterfall but with biological media in it as its a preformed container, which will also be diy in my case. I'm going to diy as much as possible and see how it goes. My 2 pumps are 9000lph and 8000 lph, and the pond is roughly going to be just over 11000 litres or 3000 gallons. I know that's not the biggest but its the only space I have unless I take down my entire decking area which I'm reluctant to do as I only built it in lockdown and I'm already removing half to extend

  11. #9
    Senior Member Rank = Adult Champion Twhitenosugar's Avatar
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    I had the same conumdrum as you with my pond as my garden isn't huge.

    To increase the volume of water I ended up making the pond 2m deep lol. Although that's probably the max depth to go to.

    I made a DIY shower (although I've turned it off for now to save running costs) which worked really well.

    Nowt wrong with DIY filters, but make sure whatever you build is easy to clean!

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  12. #10
    Senior Member Rank = Gosai KevT's Avatar
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    Hi

    I run a bottom drain gravity to Easypod (second hand + new K1 micro) really easy to clean plumbed to a rain water drain for ease - then into 2 x showers (DIY) there are two because I have the kit in a shed with limited height - been running for 3 years with no issues - run a 6k pond pump Aqua Eco Pump dry and at 40w and a 15w UV keeps 2000 litres and 9 koi very happy

    KevT

  13. #11
    Thanks folks, out if interest ( and a genuine need to know) my idea for a vortex chamber is to have an upside down traffic cone inside of a barrel with maybe brushes or something in there, i wanted to put the pipe so that the water entered into the traffic cone rather than in the space between the cone and the side of the barrel
    Putting the media aside, is this an effective cyclone idea in principle? Also, should my barrel be tall and narrow? Wide and short? Tall and wide?

 

 

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