Provide 15g of pH minus powder per 1 m3 to lower the pH by 0.2 units, directly in the basin in front of the discharge(s), filtration running.
For very hard water, it may be necessary to double this dosage.
Always adjust the pH in several steps, in increments of 0.2 pH units spaced 2 hours apart. This should be done in the absence of bathers.
