I have 2 very old model of Deltec reactor - I think one of them is a denitrator and a calcium reactor.
The denitrator selling for $85 ( dimension : 20x21x50cm) 50 is the height)
The calcium reactor selling for $80 as there is slight leak at the pump area so preferably to be used in in sump ( the colour in red )( dimension: 20x19x40cm )
self collect at Pasir Ris
WhatsApp me at 81334883 David