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You can do the peristaltic pump route for much cheaper. I got a fixed speed 2rpm Cole Parmer Masterflex peristaltic pump with 2 heads off of ebay for $40. Couple that with a few feet of high quality norprene tubing from usplastic.com and and a timer and it is a trouble free setup. I don't mess with it at all. I used to dose 2-part manually and had to also run a kalk reactor to keep the pH relatively stable (it would drift downward over time). Now with the peristaltic pump setup my pH runs 8.2-8.4 and my Alk is constant at 3.2 meq/l. Ca=450.
I also disagree with the clogging statement above.
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"Misers get up early in the morning; and burglars, I am informed, get up the night before." - GK Chesterton
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