Action Products Marketing Corp. (AP/M) began rehabilitating manholes in 1975 with a patented PERMAFORM system for replacement of manholes without digging and without interrupting flows. Recognizing that not all manholes need a complete replacement, AP/M developed its high strength, centrifugally spun cast PERMACAST system to seal and reinforce damaged structures. Its unique delivery equipment enables uniform thickness control and very dense compaction without the need for hazardous confined space entry. Quality is assured with pre-measured factory mixes for guaranteed consistency in the field.
Some techniques to overcome chronic issues of wastewater/stormwater structures.