The European Oyster Ostrea edulis is a species native to the North Sea. The efforts to harvest them for food led to a strong decline in numbers, which is paired with destroyed substrate for settlement due to commercial fishing efforts, pressure from competitors and threats by diseases, creating a challenging environment for O. edulis to recover. To reestablish the species and bring back their many ecosystem services in the North Sea restoration efforts have begun being of interest. A crucial part for the restoration of a sessile bivalve is selecting a location with conditions appropriate for resettlement of the species. A factor which has been shown to influence the health and resettlement rates in oyster reefs is the sedimentation of suspended solids. The linkage between water and sediment matrices has previously been inspected, but when they are linked by biota, not much data is yet given. To understand the fluxes of suspended solids in the presence of O. edulis and the fluxes of microplastics included in the solids, a long-term mesocosm study on the effects of environmental conditions and oyster presence on the deposition rates of suspended solids and microplastic beads was conducted. Results showed that temperature influences the deposition rates. The rates are likely increased directly through a change in water properties and indirectly through the enhanced filtration rate of oysters in increased water temperatures, leading to increased benthic-pelagic coupling. While salinity showed… as an effect, the effects of the chlorophyll-a concentration and the amount suspended solids in the water were negligible.