Arrow Drip Irrigation System Emitters Stake Flow Drippers, Garden Self Automatic Watering System, Irrigation Equipment, Self Watering Spikes, Set of 5

Works superbly well with my solar powered pump to keep the tomatoes watered.

They do the job but bear in mind that they are quite complicated to get the hang of unless you are a handyman or have quite a bit of experience with irrigation systems

These don't come with instructions. On receiving the packet, the container bag had some sort of black oily substance inside which initially I thought meant they had already been used and returned. It turns out that the black oily stuff is the supplied tubing which is clearly faulty. Unlike other drip tubing, this stuff is very soft and the oily residue leaves your hands black. I decided not to use it because I don't want this in my garden where it might leach chemicals into the soil.The design of the product is OK, in theory the water drips through the spikes and into the soil, well below the surface. This means you should get less evaporation than a surface dripper. The problem is, you can't see it working. If the spike is blocked, you might think you are watering when you are not. Only when the plants die of thirst would you realise.So, it's a fail from me. I'm giving 2 stars for the novel design, otherwise I would not recommend this.