Now on the subject of rinsing peat,,,,there is peat and then there is peat. In a sphagnum boy, the uppermost layers in a bog produce the most desirable material for growing CP. These layers are naturally low in nutrients and have great antiseptic qualities that discourage anaerobic processes. The cool conditions and lack of nitrobacter in the substrate maintains these qualities, but the deeper you mine a bog, the greater the presence of cyanobacteria (blue green algae). Blue green algae has the ability to fix nitrogen into the substrate and thrives in oxygen poor conditions (like deep in the bog, or deep in your pots where the substrate is compacted. Peat from deeper layers is NOT good and as one bag of peat looks like any other there is no way to tell by looking. If you use bad peat containing nitrogen fixing organisms, things may be good short term but eventually nitrogen will enter the picture. As salts become accumulated over time via evaportive concentration problems arise. Slime mold is an early indicator which in turn produces nutrients that the Byrophytes are able to exploit, and soon mosses and liverworts start growing as well. Fungus also exploits these available nutrient resources, and fungus gnats, aphids and other critters also soon join the community. Over time, CP fail in theis scenario.
With a TDS meter 2 independent growers and myself checked the total dissolved solids in the runoff water from the peat we were using. Recommended limits for CP are 150 PPM (parts per million) Our readings were close to 1000PPM, nearly ten times the limit! Add to this complications arising from the use of any sand not close to 100 percent silica and the problem can be drastic since non uniformly white sand must always be suspected of containing other minerals which the acidic quality of the peat will leach out over time.
There are really only two alternatives: one is to repot annually into new medium, in the meantime syringing the pots at least weekly from above to leach out these nutrients before they concentrate, but this is very demanding in terms of time spent.
The better alternative is to begin by rinsing all potting media before introducing the seeds or plants. Needed supplies are 3 5 gallon pails, 2 half full of pure water. Put your dry peat in the first, and knead the stuff to get it partially wet. Wait 2 or 3 weeks, then wring out handfulls of moss and place in the second pail, When done, dump the water out of the first pail, replace it with fresh and repeat step one. Wait another week, and take the peat from the second pail, wring it out and put into the empty remaining bucket. Wash an appropriate amount of pure silica sand a couple of times and add to the peat in the third bucket. This is your mix. Fill as many empty pots as you can with this. If you have access for cypress mulch use a layer to block the drain holes, Place these filled pots outside where the rain can reach them and the birds will leave them alone and let the rain cycle through them as long as possible by using the oldest made up pots first. Repeat the process as often as needed but I found about 2x would get me through the season and there was always a pot ready to go without added fuss. I rarely had any issues with opportunistic species and my plants thrived without re potting for many years