Automatic Water Changer

Discussion in 'Anything DIY Related' started by amalick, 19 Dec 2010.

  1. amalick

    amalick

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    Hi Guys, for those of you that are familiar with my system you will know that I am in constant search for DIY automation (i.e not profilux etc..)

    So my latest attempt will be at an automatic continuous water changer.

    I found this product online that basically continuously changes small quantities of old water with fresh SW up to 150 times per day.

    Spectrapure Litermeter III dosing pumps from Salty Critter - Your Saltwater Specialists

    This guy did a DIY and seems to have things working.

    Automatic Water Change System

    Ive attached the user manual for those interested in finer detail

    My question is ? - Does it make sense to do such incremental water changes as apposed to one big one say once a week. Are you not throwing away a lot of the good stuff if you keep changing water that often ?


    There is another system that dose water changes in larger preprogrammed quantities, but its not avalible for delivery to SA and only runs on 110v AC.

    Genesis Reef Systems
     

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    Last edited: 19 Dec 2010
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  3. Tremayn

    Tremayn

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    Well in the ocean the water constantly changes.
     
  4. ziyaadb

    ziyaadb

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    with a profilux doser u can do contious waterchanges over 24 hours daily. 1 pump to remove water the other to fill up. u can change from 1ml to 2L at a time
     
  5. amalick

    amalick Thread Starter

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    I have a five station Grotech doser and kind of have 2 stations free. The only problem is that it can only dose up to a maximum of 1 litre per day which is too little since I need to do about 10l per day.

    What are the profolux's limits ?
     
  6. ziyaadb

    ziyaadb

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  7. jumboswart

    jumboswart

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    Sounds interesting, will this system be able to pump from my garage that is about 15m away from my tank as well as having to go up in the roof and down to the tank again? What is meant by Draw Height(7,7m) and Delivery Height(18,5m)?:blush:
     
  8. Singularity

    Singularity Hmmm amper!

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    if you want a fully automated water change system you should look into solenoid valves and controllers with float switches if you really want it to be done autonomously, however i would just like to be able to do a water change from my laptop and (pressing a button to drain, pressing button to stop drain and start refill, press button to finish/stop water change) tank would have to been built to work that way though, with a dedicated drain system.
     
    Last edited: 20 Dec 2010
  9. TheWaterboy

    TheWaterboy Sponsor

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    im using the profilux doser.....best unit i ever bought and possibly the best piece of equipment on my new system..........so simple to use and just WORKS!!!!.....
    i like the d.i.y thing to but just to much of a mission for this application........you will probably spend half the money that a quad doser costs just to buy the parts, never mind the time and the aesthetics involved
     
    Last edited: 20 Dec 2010
  10. jumboswart

    jumboswart

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    So Marco would the profilux work over a fairly long distance(+-15m) and would I be able to use it if I have to go up through the ceiling?:whistling:
     
  11. TheWaterboy

    TheWaterboy Sponsor

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    it does use a parastaltic pump which do travel distance fine....not sure about heights though.....just go and check if you keen;)
     
    Last edited: 20 Dec 2010
  12. chikaboo

    chikaboo

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    Wouldn't these water changes require you to have a super sterile storage container for the new water thats coming into the system and brings us to the age old question of how and how long would this "new" water be stored for .... My logic says if we want it to be automated then we shying away from physically doing mix so often and making a batch up so we can sit back and let the "automation" take over .... so then comes the other question of some members "recycling" their old water ... can't this become like a "closed loop" system between old water and new water but changed very slowly over a period of time?
    Posted via Mobile Device
     
  13. SIMS

    SIMS

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    I'm not sure if "ow long" water can sit being an issue - I mix up 900l of salt at a time - chuck in a few pumps and use it as I need it - when its finished I start over. At times it lasts 4-6 weeks - I'm yet to have an issue.
     
  14. jumboswart

    jumboswart

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    I have 2 x 260l JoJo tanks one for RO and the other for SW mix. If I did 50l per day change(10%) a day it would last 5 days, then 5 days off to refill and start again, maybe less say 25l(5%) a day. The old water would go down the drain:thumbup:
     
  15. amalick

    amalick Thread Starter

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    Decided on a DIY

    OK so I decided to go the full DIY route. I know its a mission but thats half the fun. Will upload my schematic on the next post.
     
    Last edited: 20 Dec 2010
  16. amalick

    amalick Thread Starter

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    DIY Automatic Water Changer

    So here we go, and just incase the image isnt clear I have uploaded a pdf of the schematic as well. The only problem I have left is to source the 24v dc solenoids that are not made of copper. For this I will try a company called Astore in Stikland tommorrow, if they are still open during the silly season. Anyone know of another possible place in Cape Town ?

    I also need to be sure that what ever solenoids I get are be able to operate with little to no pressure on the gravity fed measuring containers sections. So they must not be the diaphram type but rather direct acting. I will post another thread on how I tried to ensure that the system is fail safe if any component fails to work as intended.

    All in all the system should cost +/- R 1500 which isnt bad if you ask me

    Feedback is of course most welcome :thumbup:

    [​IMG]
     

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    Last edited: 20 Dec 2010
  17. Singularity

    Singularity Hmmm amper!

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    amalick, i sourced some non metal low presure solenoids when i was looking into this about 3 years ago, cant remember the company name, but i still have a brochure on the old laptop, wasnt cheap and they do controllers etc aswell.
    Posted via Mobile Device
     
  18. amalick

    amalick Thread Starter

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    Cool, the copper ones retail for between R170 and R400 depending on inner diameter. Im only gong to use 6mm poly tubing so the R170 ones were what I was looking at getting.
     
  19. Singularity

    Singularity Hmmm amper!

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    just make sure they dont require high water presure to function properly.
    Posted via Mobile Device
     
  20. amalick

    amalick Thread Starter

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    Failsafes

    So here is the failsafe stuff I thought of in the schematic. I also updated the attached PDF on my orginal post to include them.

    Fail Safes
    · Solenoid S1 Fails : If Solenoid S1 fails or the water line gets clogged then the Waste Measuring container will not fill. Ten litres of Fresh SW will still try to dump into the sump via S4, but only up until the float switch F5 breaks the circuit.
    · Solenoid S2 and or Float switch F1 fails : If solenoid S2 fails or the gravity feed fails then the waste container will not empty. When the system next tries to run, float switch F1 will not allow a refill. If Float switch F1 also fails then the overflow on the waste measuring container will just dump water back into the sump. The failsafe as described on solenoid S1 failure will then also apply.
    · Solenoid S3 fails : If solenoid S3 fails or the line gets clogged then the fresh SW container will not fill. There will be no fresh SW to dump back into the sump. When the system next cycles float switch F3 in the sump will prevent it from starting again if the sump level is too low.
    · Solenoid S4 fails and or float switch F2 fails : If solenoid S4 fails or the line gets clogged then the fresh SW will not dump into the sump. When the system next tries to run float switch F2 will not allow a refill. If float switch F2 also fails then the overflow on the fresh SW measuring container will just dump fresh SW back into the SW reservoir.
    · Power trips during a cycle : Everything just stops
    · Float switch F1 fails : Overflow on waste measuring container will drain back into the sump
    · Float Switch F2 fails : Overflow on fresh SW measuring container will drain back into the sump
    · Sump level too low for a water Change cycle : Float switch F3 cuts power supply and everything stops
    · SW Reservoir level too low for a water change : Float switch F4 cuts power supply and everything stops
    · Tank return pump fails : Same as Solenoid S1 failsafe procedure
    · Fresh SW pump fails : Same as Solenoid S3 failsafe procedure
    Unavoidable / uncontrollable double failures
    · Solenoid S1 fails and failsafe float switch F5 fails simultaneously = Sump will overflow by 10 litres at every cycle until fresh SW reservoir is empty
    · Solenoid S3 fails and failsafe float switch F3 fails = Sump will run dry in return chamber
    · Float switch F4 fails and water level is too low. Fresh SW reservoir will run dry
     
  21. amalick

    amalick Thread Starter

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    Ya, thats my biggest concern on this entire plan.I'm not sure how I'm going to ask the supplier the question. They look at you as if you are crazy when you ask them such stupid questions LOL

    As you can see I put a lot of thought into this and it would be such a disappointment if it all falls flat because a stupid solenoid wont allow a 10l container to drain via simple gravity.
     
    Last edited: 20 Dec 2010
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