For ‘wet’ Rain Harvesting systems, it is important to drain your charged lines after it rains to remove any water remaining in the pipes. Draining this water prevents it from becoming stagnant and discoloured due to anaerobic fermentation and tannin leaching – and most importantly, stops it from being fed into your rainwater tank at the next rainfall event.
For ‘wet’ Rain Harvesting systems, the wet-dry valve makes draining charged-lines (water-filled pipes) easy.
The valve’s drain size allows for efficient draining and minimises the risk of clogging.
Customise the settings on the Wet-Dry Valve’s electronic auto-release valve to ensure your charged lines are drained.
It’s important to ensure that your wet-dry valve outlet remains clear of any debris. If your outlet becomes blocked, the chamber will not empty and the wet system of water will not drain down.
To ensure the flow of water out through your wet-dry valves outlet, periodically check the transparent conical end cap for any build-up of matter. Remove and clean the conical end cap if required.
Periodically check that the wet-dry valve batteries have charge. This is indicated by the flashing light.
To prevent your wet-dry valve from freezing or “winterising”, remove the timer prior to the first frost or freeze and store it indoors until spring. Remember to remove the batteries from the battery compartment.
For best results and minimal maintenance, we recommend installing rain heads such as our Leaf Eater rain heads on all your downpipes to limit the volume and number of leaves and debris that reach your wet system and wet-dry valve.
The exact components included in your first flush diverter kit will depend upon the product you order and are listed on each individual product page.
Your first flush diverter can be installed anywhere between your roof catchment area and your rainwater tank to isolate and capture the first “flush” of dirty water at the beginning of a rain event. You may choose to install smaller diverters to divert rainwater from each downpipe or you may choose to install larger diverters to divert rainwater from several downpipes.
In areas with mild pollution (e.g. open fields, no trees, no bird droppings or animal matter, clean environment) you should divert 0.5 litres per square metre of roof (0.0125 gallons per square foot of roof). In areas with higher pollution (e.g. leaves and debris, bird droppings, animal matter/carcasses, pollution) you should divert 2 litres per square metre of roof (0.05 gallons per square foot of roof). These formulas will help you calculate your total diversion volume or, if you’re using more than one first flush diverter, the volume of water you should divert in each device (which will depend upon the size of the roof area that “feeds” each diverter).
The length of pipe required to form your first flush diversion chamber will depend upon how much water you need to isolate and capture. The following measurements are given as a guide only.
1 metre of 90mm pipe = 5.7 litres
1 metre of 100mm pipe = 8.8 litres
1 metre of 150mm pipe = 18.8 litres
1 metre of 225mm pipe = 45 litres
1 metre of 300mm pipe = 72 litres
3 feet of 3″ pipe = 1.5 gallons
3 feet of 4″ pipe = 2 gallons
3 feet of 12″ pipe =19 gallons
Yes. Just remember that you need to size your first flush diversion chamber based on the size of the roof area that’s upstream from your diverter. If two or more pipes (aka lines) feed into a single diverter, you should size your diversion chamber accordingly by considering the total roof area that feeds both pipes.
Your first flush diverter comes with a range of flow control washers (valves). Each washer has a different sized hole. The size of the hole determines the rate at which your first flush diversion chamber will empty. A smaller hole will create a slower flow rate and release less water during a rain event, while a bigger hole will create a higher flow rate and release more water during a rain event. (Blockages excepted, any size washer will eventually fully empty your diversion chamber after each rain event.) Washers with a smaller hole will become blocked sooner than washers with a larger hole. Choosing your flow control washer is therefore a trade-off – lower wasted water during rainfall means more regular maintenance, while moderate wasted water during rainfall means less maintenance is required. However, when choosing your flow control washer, remember that the volume of water flowing from the largest washer, which has a 2mm diameter hole, will still be insignificant when compared to the rainfall flow rate.
Your diverter’s ball seat is like a funnel: \ /. The narrow end is installed facing down so it can be sealed by the black ball.
You can use 12mm irrigation tubing to plumb the trickle feed outlet to a location away from the diverter.
Slowly unscrew the black hose fitting from the bottom of your first flush diverter. If the diversion chamber is full of water, take care as the water empties. Remove the plastic filter (it may come out when you remove the black hose fitting) and wash under clean water. Check the flow control washer for any blockages and wash with clean water, then replace all these parts.