Intex PureSpa Bubble Massage 77" round (4 person): volume and chemical doses

Not safe: do not get in yet.

Two things to fix. Start with ph.

1. pH 7.9 → 7.5

   Lower it

   Add

   0.22oz

   of Dry acid / pH minus (sodium bisulfate 93%)

   6.2 g / about 1⅛ tsp by volume

   • Side effects: TA −3 ppm.
   • Run the jets with the lid open and wait at least 15 minutes (20 after pH decreaser) before anyone gets in.
   • Never add acid and chlorine together or in the same spot: mixing them releases toxic chlorine gas. Let the first one circulate before adding the other (the wait is shown on each step).

   Then wait 15 minutes with the jets running.

2. Free chlorine 1 ppm → 4 ppm

   Raise it

   Add

   0.15oz

   of Dichlor granules 56%

   4.3 g / about 1 tsp by volume

   • Side effects: CYA +2.7 ppm, TA −1.1 ppm.
   • Also raises cyanuric acid (stabilizer). It only comes down by replacing water.
   • Run the jets with the lid open and wait at least 15 minutes (20 after pH decreaser) before anyone gets in.
   • Free chlorine is below the minimum for your stabilizer level.
   • Use dichlor for the first week or two until stabilizer reaches about 30 ppm.

In range

• CYA 20 ppm
• TA 70 ppm

• Use dichlor for the first week or two until stabilizer reaches about 30 ppm.

Check the product label. Strengths vary by brand, so enter the % printed on yours. Add one chemical at a time, into the water, and never mix chemicals.

• CDC recommends not using stabilizer (cyanuric acid) in hot tubs, because it slows chlorine down. The dichlor-then-bleach method keeps it to about 30 to 40 ppm; bleach only keeps it at zero.