If the sludge production has increased suddenly: -
1) Has the quality of the fuel changed? i.e. have you started using a new batch of Bunkers, or maybe your new Bunkers are not compatible with the previous Bunkers and the reaction between them is creating this sludge.
2) Is the purifier actually discharging Sludge or is it discharging water or clean oil all through the sludge discharge?
3) is the Purifier running at the correct speed? or are the clutch pads/drive belts slipping, causing oil to discharge out of the sludge discharge.
If your purifier has a Gravity disc, is it the correct size for the density of the oil your are purifying?
4) Is the Purifier running at the correct temperature, 98C for HFO 95C for 4 stroke engine Lube, 90C for slow speed 2 stroke engine Lube.
Good luck and report back.
It is always better to ask a stupid question than to do a stupid thing.