"pH Haven" is Havenmade's pH buffer that helps to stop pH drift in hot tubs. The only safe chemical treatment for hot tubs and spas. (compare to pH Magic, which is a fine product.)
Just pour it in at fill up after you get the pH to range. Helps to hold the pH in line for weeks and weeks.
You can use this and HavenMade Alklinity Up and control your pH with the least effort and no harm to you or the spa.
This product is the only chemical we recommend for hot tubs that does not have any bad effects on the spa. The "perfect pH" products are notorious for precipitation of calcium and minerals all over the hot tubs plumbing and heater. We have had our customers go to a spa store and be sold on liquid pH balancers that have ruined many heaters. There is no stopping of misinformation in the hot tub industry. Because a product is made and sold as a pH stabilizer, does not mean it is always safe to use. Use products that you understand. We do not sell anything that has a percentage of "destruction" on heaters and ozone jets. If you have extremely low mineral content in your water, a rare thing, then you can use other products.
This is a well known safe chemical that stops pH from rising. It will normally set the pH at 7.4 to 7.5 and keep it there as long as the Total Alkalinity does not drop below 40 PPM. You can litterally go for weeks and have normal pH and only need to raise the Total Alkalinity with HavenMade Alk Up and never need to use pH Down or pH up; just a total alkalinity increaser.
One bottle can be used for 500 gallons of spa water. I put in two medium coffee mugs in our Moonbay spa with 220 gallons. It is about 1.5 Lb of "ph Haven".