Crustose coralline algae (CCA) are strong settlement inducers for two exploited limpets, Patella aspera and Patella ordinaria (Patellogastropoda: Patellidae). This study evaluates CCA-conditioned seawater (CSW) as a settlement inducer for the same species through nine assays aimed at its concentration, preservation, production, and as a settlement enhancer for sub-optimal substrates. Two additional assays tested the affinity of limpet larvae to settle on CCA surfaces. Each limpet species showed specific requirements. Settlement of P. aspera was higher in CCA than in CSW, whereas the settlement of P. ordinaria was similar between CCA and CSW. Inductive properties of CSW were nullified by filtration (2.7 μm) and weakened by dilution, but little affected by different preservation methods up to 48 h (room temperature, refrigerated, and autoclave). CSW can be produced serially from different CCA assemblages and preserved frozen during several days. Each limpet species responded differently to CCA and CSW when combined with diatom biofilms. Specific strategies for post larval production are recommended. P. aspera could use CCA-coated structures as collectors designed for limpet settlers in animal production and recruits in the wild; while P. ordinaria may employ movable plates for settlement induction based on CSW. Settlers would require transport to nursery grounds for grow-out.