Mortaring concrete pavers on top of a concrete slab does not necessarily make it the proper way. It is actually a worse method for any material if you have freeze/thaw, and nearly double the cost. A properly designed and installed base performs perfectly.

If you have low spots you can remove sections of interlocking pavers, relevel with bedding sand, and relay the pavers.

Look at Daltile’s series of porcelain pavers. Porcelain is much better choice than porous concrete based ones.

https://www.daltile.com/Search#q=xterior%20pavers&firstQueryCause=omniboxFromLink&firstQueryMeta=%7B%22partialQueries%22:%22X%3BXt%3BXte%22%20,%20%22suggestionRanking%22:0%20,%20%22suggestions%22:%22xterior%20pavers%3Bxteriors%20brochure%3Bxteriors%3Bexterior%20pavers%3Bexterior%20floor%20tile%22%20,%20%22partialQuery%22:%22Xte%22

Yes I have a feeling I will have to relay a bunch of low spots. I think too much sand was used and less gravel when it rains the sand went away causing low spots. I still feel the color choice I messed up on and think longer pavers would be nicer.

I grabbed a couple Houzz photos of similar combinations in case they help:

Thanks I had someone do it but I think as you said I need to pull them up and relay them as there are high and low spots. Any tips on best way to relay and level them. I also had the poly sand in between but ants still make mounds and I feel like it's a losing battle.

I’ve had pavers ( concrete, larger than yours ) installed at 3 different homes. Never had a problem with high / low spots, all were installed on a compacted sand surface. Mine look much like the first picture Ginatay posted. i would try to have them repaired, seems like a big waste to remove & replace them.

Yes I think I am going to repair them the base is sand and gravel with polymeric sand in between. Any suggestions on best way to repair them as I plan on doing it myself thanks

The rain helped show the low spots but it's there any tips to use? Is there a superior polymeric sand for in between pavers? More gravel then sand? Should I pull it all up or section by section thanks

I see only one puddle and perhaps one low corner. Is it possible that you are being too much of a perfectionist?😁 However, if you must do repairs, you could try repairing only the low areas first and see if you are satisfied. 3onthetree above described the process. Lift the low pavers out carefully, add more paver sand underneath, level the sand, and re-lay the pavers, tamping them with a rubber mallet and using a long level across existing pavers to check height and slope. As for which polymeric sand to use, ideally you would use the same brand and color as originally installed so the repair blends in. However, in answer to your question, G2 Super Sand is a good brand sold here. I will say that polymeric sand is helpful but is not foolproof. It will still swell when wet, weeds will still root in it, etc. Another benefit of having a patio made with gravel and sand base as opposed to setting pavers in concrete (besides flexing with freeze/thaw) is that it’s permeable. At least some the rain water can soak through to the ground underneath instead of it all running off to another location.

If you don't have a 4' or 6' level, you can use a straight 1x board, 8' is even better. Buy medium coarse sand (not play or masonry sand) and a trowel (I use a triangle brick trowel but I suppose a solid spatula can work). Use the trowel to slip into the side and negotiate the 1st paver up. Lay the straightedge past the dip to determine how many pavers to remove. Place sand with the trowel/remove some as needed to achieve level with the straightedge (+paver). Check every couple pavers as you relay. You shouldn't need to ever hammer down interlocking pavers, that just displaces the sand underneath (unless you are high, then remove the squeezed out sand). Note you want to put them as tight as you can, because when you get to the last one it'll be a tough insertion.

As far as polymeric for the joints, it is a very finicky product to apply correctly. If the rest of patio is in poor condition, you would powerwash it all out and reapply all new. Or, if you aren't happy with polymeric, you could just use the medium coarse sand to fill the joints, and most of the water will pass through the joints whether you have dips or not.

This patio is Unilock Beacon Hill Fossil Random Flagstone Pavers.

That is nice and what I should have went with. Looks more natural stone. For now I will fix the low spots so my kids didn't trip when running on it.

@3onthetree Thanks for the tips. I think I will stick with polymetric sand as I already have it in the pavers and most of patio in good shape just some low spots.

Looks like you are on a slope and possibly the patio was installed to move water away from the house and keep it from backing up into the house. If you have water coming off the roof of the house and also coming down the hill, you want the patio sloped, and may be low spots towards the edges as it settles. I am also on a slope and when I get torrential downpours, I can see water collecting in a moat around my house as the grade moves the water around my house. This also results in some puddling at the edge of my patio because the patio is sloped away from the house. Hard surfaces don’t absorb water, so all the rain that lands on your patio has to go somewhere, and it looks like it goes away from your house.

Yes it's sloped to go away from the house there are just some spots where the pavers are lower then level these are 2 trouble spots I want to fix. One area going down the steps I repaired last season the sand was missing underneath and someone could have gotten very hurt. This area a chipmunk keeps making a home that I need to fix as well

Dig Doug’s idea looks great! i really like thise pavers. Good call

Dereck Swordsward year old and most likely finished by now......................