Hello,
I was looking for a way to shock a 38,000 gal indoor pool. We usually use Liquid Chlorine, but I was hoping to use MPS instead.
Recently, we drained and filled the pool, then got the numbers set:
Fc- 3.2, Tc- 3.4, pH- 7.4, Alk- 80, Hard- 205
In the past, I've had issues juggling the Combined Chlorine between 0.0-0.4, so after a swim session, I tossed in 4lbs of MPS. The next day, the Total was unreadable as it exceed the value on my PalinTest PoolTest 9 device. Over the course of a week, one of my pool maintenance workers noticed the free chlorine would start clear and slowly build in pink color over time. Not exactly sure when this started happening. After about 20 mins, the color starts to stabilize. We diluted the test in half and were able to get a reading. It would be about 4.1 ppm. I assume multiply that by two with the dilution. So, we are looking at 8.2 ppm. We stopped adding chlorine once this happened, and the same values seem to keep coming up.
I attempted to get a K-1518 kit to test with MPS present. The chlorine acted the same way. Usually, when we test and drop the DPD1 tab in with the PalinTest, the water turns pink instantly and the pink color remains until we throw it out. While working with the K-1518 kit, even with the deox reagent, the color is still changing while I'm performing the test. I'm unsure if this is still ok to do if this happens. I did try waiting out the 20 mins until stable and the tests usually line up with one another... Palin vs. Taylor.
Any insight?