A 
interreg 
Baltic Sea Region 
JROPEAN 
Z6I0MAL 
*VELOPMENT 
It 
rı COMPLETE PLUS 
WW is not recommended or even prohibited and the ship must be cleaned in dry-dock 
af; 
Table 6: Key for a recommended IWC procedures in the Baltic Sea Region 
Cleaning allowed 
Capture and Filtration 
Capture and Filtration including biocides and/ or prior chemical risk ass>ssment 
*IWC not permitted (Drv-doc') 
Green: Cleaning allowed 
If cleaning is allowed without capture and filtration without any further restrictions, “there needs to 
be a high level of confidence that there are no specific biosecurity risks associated” (Department 
df the Environment and MPI 2015)” based on the ship’s trading area. Therefore, IWC without 
capture and filtration is rated to contain an unacceptable risk in almost all cases, except for ships 
with a trading area of the same Biofouling species, fulfilling the preconditions of accessible hull 
and niche areas and that IWC on the AFS is possible according to the manufacturer’s specification. 
In addition to these preconditions and a low level of fouling, a risk of hazardous substances and 
particle input needs to be ruled out. 
Since all types of AFS, biocidal and biocide-free ones, contain the risk of particle input during IWC, 
(information from stakeholder meeting), there is no permission of cleaning without capture and 
filtration proposed at the present moment. 
A permission of IWC without any further restrictions in the future requires a development of 
coatings not containing a contamination risk. 
Yellow: IWC with Capture & Filtration 
As of today, IWC in the Baltic Sea is only allowed when at least the fouling material that comes off 
and the water used for cleaning is captured and filtered. If not captured, the cleaned material might 
continue to be able to exist and spread as IAS (Woods et al. 2007). Due to abrasion through IWC 
also particles can enter the marine environment, e.g. resulting in polymers in form of microplastics 
spreading and cause harm to the ecosystem. 
Therefore, cleaning with capture accumulates polluted water. This polluted or contaminated water 
subsequently needs to be filtered and separated in waste and water influent to maintain the particle 
input at a certain level (Soon et al. 2021). 
I