Water is intermittently hard, especially just before scheduled regenerations.

Safety: This is a programming and sizing issue; no disassembly is required.

Steps:

• Test actual hardness: Use a reliable hardness test kit to measure raw water hardness. Compare to the value programmed in the Clack controller.
• Adjust hardness setting: Increase the programmed hardness to match or slightly exceed the tested value, especially if iron or manganese are present (add 3–5 gpg equivalent).
• Review capacity and reserve: Confirm that the programmed capacity and reserve are appropriate for your resin volume and household usage. Increase reserve gallons if you frequently run out of soft water before regeneration.
• Check meter programming: Ensure the correct meter type and size are selected so that water usage is measured accurately.
• Monitor results: After adjustments, monitor hardness over several days. If intermittent hardness persists, consult a professional to verify system sizing.

Tip: Households with variable occupancy may benefit from a slightly higher reserve setting to avoid hard water spikes.