Heunix actually means that a trichlor puck dispenser will drive your stabilizer, not your calcium hardness, sky high and your pH dirt low.
However, that's not necessarily always the case. If what you have is a trichlor feeder, it certainly can be used, as long as you realize that trichlor pucks contain stabilizer, and as your stabilizer rises, your minimum chlorine level needs to rise too. (See Ben's Best Guess chart). Since you don't have any stabilizer in the pool, that's not a bad thing--you're going to have to add some. Also considering the fact that as gunite and plaster cure, your pH tends to rise, requiring large amounts of muriatic acid to keep it within range. The trichlor pucks are acidic, which will tend to help keep your pH from rising as quickly, and add stabilizer to your water, so they actually may be your best choice for chlorination right now. You can switch to bleach later on when your stabilizer levels get to where you want them to be.
Janet
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