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Thread: Considering DIY peristaltic pump, where to inject?

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    Considering DIY peristaltic pump, where to inject?

    I switched from pucks to 11% bleach 2 weeks ago, and so far so good.

    Now I'd like to automate the injection of chlorine. Ebay has peristaltic pumps for < £30 and the control and timing of them won't be a problem.

    I think I need to inject the chlorine after the pool pump, filter, and heater, and into the return line. The pressure at this point is probably < 10psi. To do this I need a fitting to inject into the 1.5" ABS pool piping and a non-return valve.

    Can anyone suggest a suitable fitting?

    Anything else I need to consider?

    Thanks!
    12ft x 24ft x 4ft inground vinyl, 32,000 litres, 3 phase 1.25hp Waterco pump on DIY VFD for cheap variable speed. 18kW Heat pump, Lacron sand filter, Solarmatt, 10kW Solar PV

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    bobodaclown's Avatar
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    Re: Considering DIY peristaltic pump, where to inject?

    you might want to look at a duckbill valve.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Mod Squad Bama Rambler's Avatar
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    Re: Considering DIY peristaltic pump, where to inject?

    You can buy a threaded check valve and just drill and thread the return line for the valve and attach the line using a tubing to threaded adapter.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Considering DIY peristaltic pump, where to inject?

    Thanks for that. I have found the Reinforced Plastic Clamp Saddle on this page
    http://www.leisureteq.co.uk/pdf/135%20- ... plings.pdf

    or the UCAK-3CE on here
    http://www.leisureteq.co.uk/pdf/128%20- ... 0Pumps.pdf

    or the SPET01 on here
    http://www.leisureteq.co.uk/pdf/125%20- ... Spares.pdf


    Any recommendations?
    12ft x 24ft x 4ft inground vinyl, 32,000 litres, 3 phase 1.25hp Waterco pump on DIY VFD for cheap variable speed. 18kW Heat pump, Lacron sand filter, Solarmatt, 10kW Solar PV

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    Mod Squad Bama Rambler's Avatar
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    Re: Considering DIY peristaltic pump, where to inject?

    The plastic saddle clamp is fine but I'd go with the UCINJCE injection check valve.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Considering DIY peristaltic pump, where to inject?

    Right, the UCINJCE has arrived - thanks for the pointer BR.

    1st issue is that the thread does not go all the way up the shaft so drilling and tapping a normal 1.5" pipe will not work. I was thinking of drilling and tapping into a coupler like this one http://www.1st-direct.com/1-534;-abs-pl ... etails.htm as this gives more thickness to work with. Any view on whether this will be ok, or whether I should just get a saddle clamp?

    2nd, I was thinking of using a pump similar to this, http://www.aspenpumps.com/en/standard.html as they are fairly cheap on ebay. I now have some 6mm PTFE tubing for the chemical, however now it has arrived I've realised it is quite rigid. I am unclear whether the pumps have their own internal tubing which then connects to inlet and outlet lengths of tubing, or whether I would provide a single length of my ptfe tubing which would then thread through the pump. If the latter, would this tube be suitable for this pump?

    [attachment=0:15d4sf35]IMG-20110823-00067.jpg[/attachment:15d4sf35]
    12ft x 24ft x 4ft inground vinyl, 32,000 litres, 3 phase 1.25hp Waterco pump on DIY VFD for cheap variable speed. 18kW Heat pump, Lacron sand filter, Solarmatt, 10kW Solar PV

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    Re: Considering DIY peristaltic pump, where to inject?

    Anyone?

    Anyone know whether the ptfe tube will work with the pump, or whether it is too rigid?
    12ft x 24ft x 4ft inground vinyl, 32,000 litres, 3 phase 1.25hp Waterco pump on DIY VFD for cheap variable speed. 18kW Heat pump, Lacron sand filter, Solarmatt, 10kW Solar PV

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    Mod Squad Bama Rambler's Avatar
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    Re: Considering DIY peristaltic pump, where to inject?

    You actually can drill and tap the PVC pipe. That's how mine is done. If you want to use the coupling you certainly can.

    The PTFE tubing you have will work fine. The pump will come with a pump tube that your tubing will attach to.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Considering DIY peristaltic pump, where to inject?

    Quick update. I didn't have to drill and tap anything as the injector valve actually fitted into one of the two 1/4" screw threads on the multiport valve which normally take pressure gauges.

    The Aspen peristaltic pump unit-normally used to drain condensate from AC units works well, but needed a slight modification to run continuously whenever power is applied.

    I have tested the setup and it supplies 100ml fluid each minute of operation.

    The pipe and fittings on the pump are 6mm ID and my PTFE pipe is 4mm ID. I am trying to find some stainless or suitable plastic adaptors to convert between these sizes. The only ones I have found so far are brass and are therefore corroding.

    Anyone found anything suitable and available to the UK?
    12ft x 24ft x 4ft inground vinyl, 32,000 litres, 3 phase 1.25hp Waterco pump on DIY VFD for cheap variable speed. 18kW Heat pump, Lacron sand filter, Solarmatt, 10kW Solar PV

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    Mod Squad Bama Rambler's Avatar
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    Re: Considering DIY peristaltic pump, where to inject?

    Glad it's working for you. Sorry I can't suggest a place to find adapters.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Considering DIY peristaltic pump, where to inject?

    Quote Originally Posted by a34536
    1st issue is that the thread does not go all the way up the shaft so drilling and tapping a normal 1.5" pipe will not work. I was thinking of drilling and tapping into a coupler like this one http://www.1st-direct.com/1-534;-abs-pl ... etails.htm as this gives more thickness to work with. Any view on whether this will be ok, or whether I should just get a saddle clamp?

    *******
    Quick update. I didn't have to drill and tap anything as the injector valve actually fitted into one of the two 1/4" screw threads on the multiport valve which normally take pressure gauges.
    I installed a Stenner injection pump a few weeks ago. I'm no expert, but everything I read in prep for installing mine suggested injecting after all of your equipment to prevent exposing them to a higher concentrate of bleach. I would guess that by injecting into the multiport, you are still upstream from at least your heater, and maybe more.

    My check valve was just like you pictured. You can still drill and tap pvc even though the check valve threads don't go all the way to the end if you want to relocate it further down stream. I think the non-threaded extension is to inject more towards the center of the pipe for better/faster blending, which I don't think is needed in pool applications, and you can simply cut that extension to any desired length if it is too long. I cut my extension completely off so that I could screw it into a schedule 80 plastic elbow to make my check valve lay parallel and close to the pvc pipe. I didn't want my check valve sticking out where it could easily get bumped by accident and possibly broken off, and mounted it somewhat on the bottom of the pipe so that the pipe would provide some protection as well. Here is a picture of my install:

    Sorry, but I don't know of any source for the hose adapters you are looking for either.
    19,000 gal gunite pool/spa combo, Pool Waterfall feature, Jandy RS-6 One Touch controller, Pentair VS 11018 pump (new 2012), Pentair 2 hp Challenger Pump for spa jets, TR-100 Sand filter, Jandy Lite 2 Heater (250k BTU), 320 Tab Chlorinator, Stenner 45MPH2 bleach metering pump (new 2012), Glacier Pool Chiller GPC-25 (new 2012), Polaris 280 cleaner w/ 3/4 hp Booster Pump

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    Re: Considering DIY peristaltic pump, where to inject?

    Yes, by injecting into the multiport I am upstream of the heater, and possibly the sand filter and I may change it at some point. My gut feel is that the slow feed rate of 0.1L per minute for a couple of minutes shouldn't cause problems. Happy to be corrected.

    Nice job on the 90 deg elbow.
    12ft x 24ft x 4ft inground vinyl, 32,000 litres, 3 phase 1.25hp Waterco pump on DIY VFD for cheap variable speed. 18kW Heat pump, Lacron sand filter, Solarmatt, 10kW Solar PV

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    Re: Considering DIY peristaltic pump, where to inject?

    Quote Originally Posted by a34536
    Yes, by injecting into the multiport I am upstream of the heater, and possibly the sand filter and I may change it at some point. My gut feel is that the slow feed rate of 0.1L per minute for a couple of minutes shouldn't cause problems. Happy to be corrected.
    Honestly, I was thinking the same thing when I did mine, even though I ended up taping the return downstream of everything. I have a puck feeder installed and a check valve between it and the heater, so there is no chance of getting super chlorinated water into the heater. I suppose the only danger might be if the chlorine pump happens to run for a while when the pool pump is off. Mine is protected by the computer so no chance of that happening either.
    IG 23K Gal, Quad DE 80, PebbleSheen, Intelliflo VS+SVRS, MT 400 NG, Stenner Pump

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