A microparticle filter (700, 800, 900, 2000) suitable for filtering microparticles from effluent from a textile treatment apparatus, the filter comprising: a filter chamber (701, 801, 901, 2001) comprising chamber walls (902, 2002), an inlet (703, 803, 2003) and an outlet (704, 904, 2004); a filter medium (706, 806, 906, 2006) contained within the filter chamber (701, 801, 901, 2001), the filter medium (706, 806, 906, 2006) configured to filter microparticles from the effluent forming a filter residue and providing a filtered effluent to the outlet (704, 904, 2004); a filter residue collection chamber (707, 807, 907, 2007) located external to the filter chamber (701, 801, 901, 2001); a filter residue removal apparatus; and wherein the chamber walls (902, 2002) comprise an opening (811, 911, 2011) and a moveable member (705, 905, 2005) movable between a first and a second configuration; wherein: in the first configuration the moveable member (705, 905, 2005) cooperates with the chamber walls (902, 2002) to seal the filter chamber (701, 801, 901, 2001) so entry of the effluent into the filter chamber (701, 801, 901, 2001) is through the inlet (703, 803, 2003) only, and exit of the filtered effluent from the filter chamber (701, 801, 901, 2001) is through the outlet (704, 904, 2004) only; and in the second configuration the moveable member (705, 905, 2005) has moved to provide an opening (811, 911, 2011) in the chamber walls (902, 2002) so that the filter residue removal apparatus is operable to remove filter residue from the within the filter chamber (701, 801, 901, 2001) to the filter residue collection chamber (707, 807, 907, 2007) through the opening (811, 911, 2011); characterised in that: the filter medium (706, 806, 906, 2006) comprises a central axis through the centre of the filter medium (706, 806, 906, 2006) and the filter medium (706, 806, 906, 2006) is rotatable around the central axis; and the filter residue removal apparatus comprises a rotary actuator (709, 809, 909) configured to rotate the filter medium (706, 806, 906, 2006) to throw filter residue off the filter medium (706, 806, 906, 2006). a filter chamber (701, 801, 901, 2001) comprising chamber walls (902, 2002), an inlet (703, 803, 2003) and an outlet (704, 904, 2004); a filter medium (706, 806, 906, 2006) contained within the filter chamber (701, 801, 901, 2001), the filter medium (706, 806, 906, 2006) configured to filter microparticles from the effluent forming a filter residue and providing a filtered effluent to the outlet (704, 904, 2004); a filter residue collection chamber (707, 807, 907, 2007) located external to the filter chamber (701, 801, 901, 2001); a filter residue removal apparatus; and in the first configuration the moveable member (705, 905, 2005) cooperates with the chamber walls (902, 2002) to seal the filter chamber (701, 801, 901, 2001) so entry of the effluent into the filter chamber (701, 801, 901, 2001) is through the inlet (703, 803, 2003) only, and exit of the filtered effluent from the filter chamber (701, 801, 901, 2001) is through the outlet (704, 904, 2004) only; and in the second configuration the moveable member (705, 905, 2005) has moved to provide an opening (811, 911, 2011) in the chamber walls (902, 2002) so that the filter residue removal apparatus is operable to remove filter residue from the within the filter chamber (701, 801, 901, 2001) to the filter residue collection chamber (707, 807, 907, 2007) through the opening (811, 911, 2011); characterised in that: the filter medium (706, 806, 906, 2006) comprises a central axis through the centre of the filter medium (706, 806, 906, 2006) and the filter medium (706, 806, 906, 2006) is rotatable around the central axis; and the filter residue removal apparatus comprises a rotary actuator (709, 809, 909) configured to rotate the filter medium (706, 806, 906, 2006) to throw filter residue off the filter medium (706, 806, 906, 2006). the filter medium (706, 806, 906, 2006) comprises a central axis through the centre of the filter medium (706, 806, 906, 2006) and the filter medium (706, 806, 906, 2006) is rotatable around the central axis; and the filter residue removal apparatus comprises a rotary actuator (709, 809, 909) configured to rotate the filter medium (706, 806, 906, 2006) to throw filter residue off the filter medium (706, 806, 906, 2006).