Apex Grow ships hydroponic equipment to Perth and Western Australia from our Melbourne warehouse. Perth orders typically arrive within 4 to 6 business days with tracked delivery. This guide covers what Perth growers specifically need to know about Western Australian water quality, climate, and the equipment decisions that suit Perth growing conditions.
Perth tap water for hydroponics
Perth has the most variable tap water of any Australian capital city and in some areas the hardest. Perth sources water from a combination of surface catchments, desalination plants, and groundwater aquifers. This diversity of supply creates significant variation across the network that makes suburb-by-suburb testing more important in Perth than anywhere else in Australia.
Average hardness across Perth is approximately 96 mg/L but the range is extreme. Inner city Perth supplied from desalination or surface catchments may run 30 to 60 mg/L, which is soft and manageable. Northern suburbs drawing heavily from bore water can exceed 200 mg/L, which is harder than any suburb in any other Australian capital and above the aesthetic guideline for drinking water quality. Starting EC in Perth can range from 0.2 mS/cm in softer supply zones to over 0.6 mS/cm in high-hardness northern suburbs. Starting pH is typically 7.2 to 8.0.
The practical implication is clear: Perth growers cannot rely on city-wide averages. Measure your specific tap water EC before setting up your first reservoir and before every subsequent reservoir change. If your starting EC is above 0.4 mS/cm, that water already contains substantial dissolved minerals before any nutrients are added. Your total reservoir EC target includes both the background mineral content and the nutrients you add, not just the nutrients. Growers in high-hardness northern Perth suburbs may find their tap water calcium and magnesium content is sufficient to partially or fully replace Cal-Mag supplementation.
Perth Water uses a mix of treatment approaches depending on the supply source. Bore water in particular can carry elevated iron, manganese, and other minerals that affect nutrient solution chemistry in ways that standard city tap water does not. If you are on a bore water supply, a more thorough water test beyond just EC and pH is worth doing before your first grow.
Growing indoors in Perth: what the climate means for your setup
Perth has a Mediterranean climate with the most consistent heat of any major Australian city through summer. Sustained temperatures above 35 degrees Celsius are common from November through March, and heatwaves above 40 degrees occur several times per summer. The dry heat is similar to Adelaide but with less humidity, which creates different growing challenges.
The dry Perth climate means humidity is typically lower than eastern states through summer. This pushes VPD toward the higher end of the range, which can increase transpiration demand and cause plants to consume water faster than roots can replace it during the hottest periods. Reservoir EC can rise quickly as water evaporates faster than nutrients are absorbed. Checking EC more frequently during Perth heatwaves and topping up with plain water to maintain target concentration is standard practice for Perth growers through summer.
Winter in Perth is mild and wet. Ambient humidity rises significantly through June to August, which can push VPD lower and require dehumidification in enclosed grow tents during the wet season. Perth growers need to manage different seasonal challenges at opposite ends of the year, similar to Brisbane but driven by different climate patterns.
Reservoir temperature management through Perth summer requires active attention. The dry heat means grow room temperatures can spike rapidly during afternoon periods. Running lights overnight shifts the heat generation away from the hottest part of the day, which is the most effective free adjustment Perth growers can make before investing in active cooling.
LED versus HPS for Perth growers
LED is the clear choice for Perth. Summer heat management is the dominant challenge for Perth growers and LED reduces the heat load inside the tent significantly compared to HPS. Perth also has relatively high electricity costs, making the running cost saving from LED meaningful over a full growing year. The SANlight EVO Series delivers the highest efficacy available in Australia, which translates directly to lower electricity costs per gram of yield at Perth electricity rates.
Hydroponic supplies shipped to Perth from Melbourne
Everything we stock ships to Perth with tracked delivery. Delivery takes 4 to 6 business days to most Perth metro postcodes. The full range covers full spectrum LED grow lights, hydroponics nutrients, HOMEbox grow tents, hydro pots and hydroponic systems, pH and EC meters, coco coir, perlite and clay growing media, and ventilation and climate control equipment. Contact us at hello@apexgrow.com.au for questions about products or delivery to your Perth postcode.
Frequently Asked Questions
How long does delivery take from Apex Grow to Perth?
Most Perth metro orders arrive within 4 to 6 business days from our Melbourne warehouse with tracked delivery. Regional Western Australia typically takes 5 to 10 business days depending on the postcode and distance from the metro area.
Why does Perth tap water vary so much between suburbs?
Perth draws water from multiple sources including surface catchments, desalination plants, and groundwater aquifers. Northern suburbs that draw heavily from bore water can have hardness above 200 mg/L while inner city suburbs on desalination supply may run as low as 30 mg/L. Measuring your specific tap water EC before every grow is more important in Perth than anywhere else in Australia.
Do Perth growers need Cal-Mag supplementation?
It depends entirely on which water supply zone you are in. High-hardness northern suburban growers often have enough calcium and magnesium in their tap water to reduce or eliminate Cal-Mag supplementation. Growers on softer desalination-supplied water in the inner city may still benefit from it. Measure your tap water first before deciding.
How do I manage my grow room during Perth heatwaves?
Run lights overnight during the hottest periods to shift heat generation away from peak afternoon temperatures. Ensure your inline fan is sized with genuine headroom above minimum requirements so it can ramp up during heatwaves. Monitor reservoir temperature directly and use insulation or frozen water bottles to keep solution below 22 degrees Celsius.