You can smear vaseline on any joints that are above ground. Stuff easily wipes off and the remainder can be cleaned off with an alcohol saturated paper towel. Depending on the geometry of the joint you may also use vinyl electrical tape, cheapest you can get at Home Depot etc. Stretch it tight and it will conform to ridges and irregularities. A common leak place is the pump basket lid seal. Clean it off and relube it with silicone grease. Start there and work towars the skimmer. On low speed there may not be enough flow to clear bubbles from under the lid and this is normal. High speed usually flushed trapped bubbles eventually.
Al