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Re: [APD] Re: Fertilizer Dosing Pump

But the flow rate minimum is not critically important, no?
Can't one accomodate the rate of flow by diluting the

Scott H.

--- David Grim <grim1214 at bellsouth_net> wrote:

>> Adam,
> I believe I bought two of the 3 cycles per minute model
> SP100FO, 115VAC,
> norprene tubing, one with
> 0.8mm ID (1/16") and one with 1.6mm ID (1/32") tubing,
> enclosure and a two
> prong plug.
> The problem with most of the hobby marketed peristaltic
> pumps is the minumum
> volume they deliver is WAY too much for a smaller volume
> planted tank in the
> 10-75 gallon range. These APT pumps are perfect for the
> smaller tank
> application.
> I based my choice on the amount of TMG I would need to
> deliver to each tank,
> in this case a 240 gallon and a 30 gallon. Look at the
> volume/minute of the
> various tubing diameters and the cycles/minute of the
> pumps. the wider the
> ID of the tube the more volume delivered. The more
> cycles/minute of the pump
> the more volume delivered.
> In the case of the 30 gallon the daily dose of TMG was
> about 3 ml, so it
> made sense to go with the slowest cyle rate and the
> narrowest ID of the
> tubing. This way I could deliver 3 ml of TMG over a 15
> minute or so period,
> spaced out to 4 doses daily using a programmable digital
> timer. The 240
> required about 20 ml of TMG, so I went with a slightly
> wider ID for the
> tubing and spaced out the delivery over 4 doses daily
> with a digital timer.
> Determine how much fert (ml) you need to deliver, and
> divide by the various
> volume delivery rates from the APT SP100 web page and you
> can get a rough
> idea how many minutes you can space it out with. Use this
> as a rough
> guesstimate. You can always fine tune it.
> When I got my pumps up and running I ran each and timed
> how long it actually
> took to deliver the volume of ferts I needed, divided
> that time by 4, and
> then set the digi timer to run for that length 4 times
> daily. It probably
> doesn't matter, but I thought it might be better for the
> plants to space it
> out to give them some during the entire day, instead of
> pumping it all in at
> one sitting in the morning.

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