In most circumstances, the correct balance of accelerator can be maintained in the solution by means of the appropriate Replenisher material.

However, if it is necessary to dissolve Potassium Hydroxide flake into the solution regularly to maintain the alkalinity of the stripper at the correct level, then a convenient way is to utilise a bag filter chamber. This is sited above solution level so that leakage from the tank does not occur when the chamber is opened. The filter bag is not used. The Potassium Hydroxide is retained in the bag support basket, which is chosen to have a mesh size (approximately 6mm) to retain the alkali flakes. Taps are incorporated into the pipework to enable the chamber to be switched in or out of the pump circuit. With the taps switched to bypass the chamber, it is drained and the liquid returned to the tank. The chamber should have some sort of quick release lid, bolts will prove tedious in use and will lead to alkali additions not being made regularly. The seal to the lid should be resistant to the stripping solution and to deliquescent Potassium Hydroxide. The chamber is filled with Potassium Hydroxide flakes sufficient to raise the alkalinity the required amount. The stripper will work with varying levels of accelerator. Too little will cause the stripping rate to be too slow, too much may cause base metal attack to Aluminium and other alkali sensitive metals such as Zinc and Magnesium. After the chamber has been closed the valves are set to pump the solution through the chamber until all the alkali has dissolved or titration shows that the required alkalinity has been reached.