you dont have to get a pump with a plate or counterflow, use the imersion as a prechiller. but a pump to recirculate the chilled water through the pre chiller is better.
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i live in round rock, texas and have been uable to find a water report that lists the appropriate info. what are some keywords i should use when googling. ive asked a local brewer and some club members and no one knows. thanks.
Did you post to the Texas Carboys or Austin Zealots? I've posted info out to the Zealots Yahoo group a few times.
You should receive the annual drinking water quality report by July 1, the City hasn't posted online as of yet -- the one available at http://dww.tceq.texas.gov/CCR/ (search for "City of Round Rock" or TX2460003) does not include the secondaries that you would want for sulfate/hardness/calcium etc. pH usually ranges from 7.3 - 7.6, raw water alkalinity is ~155.
Chloramine levels depend on how far you live from the water treatment/pump stations, but be aware that with historical levels in distribution minimum of 2.15 mg/L (measured as total chlorine) and levels above 3 mg/L out of the treatment plant that you need to dechloraminate. Carbon filtration may not remove all if you don't have sufficient contact time to hit a removal efficiency that you need.
Assuming that Kim Lutz is still handling the water quality data for Round Rock, you can call her at (512) 341-3333 or email firstname.lastname@example.org for more recent data.
You can also get your water tested by LCRA Environmental Services in southeast Austin, they have a residential water supply testing services https://els.lcra.org/RWST.aspx.