Drain or Partial Drain then SLAM

zcmack

Active member
Apr 1, 2021
42
Las Vegas, NV
Apologies if this is mis-categorized as it kind of crosses several categories.

I typically expect to drain my pool once a year as my fill water is hard and after about a year my CH rises to >600ppm. I'm right at that level today.

However, Las Vegas has also introduced new water billing rates for high consumption users (in summer, users >28k gallons monthly) that I would love to avoid "funding." I estimated that I could get by with doing partial drains twice annually. Even better if I can do a partial drain and fill with softened water.

I did notice a bit of green along the waterline on the shady side last week and have noticed my SWG is not keeping pace, so I figure I'm also due to SLAM.

Is there anything I should be considering before I go ahead with a ~50% drain, refill, stabilize and SLAM? My CYA is at ~100 right now so I figure the drain will allow me to SLAM at a more traditional (~80) CYA rather than the 100 that has worked for me in Las Vegas.
 
100 CYA is always suspect as we have seen 100 really be 150 or higher. It is recommended that you do a diluted CYA test for anything over 90. I would hate to see you drain and refill half of your pool when in reality you needed to drain 3/4 of your pool.

 
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