Wait until the plant is about 8 inches tall or has several sets of true leaves with an established root system. Hand-water from the top for the first 7 to 10 days after transplanting. If the roots can't drink fast enough, the tray will stay wet and the plant can drown. Patience during this stage is the single most important factor for a successful AutoPot grow.

You need something that wicks moisture upward and drains freely. Coco/perlite blends (50/50 to 70/30) are the most popular and perform consistently. Living soil works well if you keep nutrients in the top-dress and run plain water in the reservoir. Soil/clay pebble blends and soil/perlite also work. Always add a 1" drainage layer at the bottom of the pot (perlite or clay pebbles), or skip it entirely by using an AirBase. One critical rule: once the system is turned on, do not top-water. See the salt buildup question below for why.

Salt buildup is the most common concern with bottom-fed systems, and it's manageable with three practices. First, run your nutrients at 50 to 75% of the manufacturer's recommended dose. Most experienced AutoPot growers find 0.8 to 1.0 EC is the sweet spot. Second, use clean mineral-based nutrients (General Hydroponics, Canna, Jack's, etc.) through the reservoir. Organic inputs should go directly on the soil surface as dry amendments, not through the lines, where they cause biofilm and clogging. Third, never top-water once the system is running. In a bottom-fed system, salts accumulate harmlessly at the top of the medium, away from roots. Top-watering pushes them back down and causes lockout. Products like Easy2Flow can also help keep lines and valves clear.

The 3.9-gallon pot is the standard choice for most growers and supports full-cycle plants with room for a healthy root system. The 2.2-gallon pot is better for smaller plants, shorter cycles, or tight spaces like 2x2 tents where you want to fit more plants. If you're running coco/perlite with mineral nutrients, 2.2 gallons is often enough. If you're using living soil and want longer runs between amendments, 3.9 gallons gives the biology more room to work.

Refill when the reservoir is about one-third full and never let it run dry (air in the lines breaks the valve's vacuum seal). Check pH every few days, as it tends to drift up 0.1 to 0.2 per day. Most growers fully refresh the reservoir once a week: dump, rinse, mix fresh. For reservoir sizing, a 12.4-gallon hard tank works for 1 to 4 small pots, a 25-gallon FlexiTank covers most 4 to 8 pot setups, and 10+ pots need 50 gallons or larger. Between grow cycles, clean the AQUAvalve5 with warm soapy water (an old toothbrush helps), flush all lines with Easy2Flow, and rinse the trays. That's all it takes to keep the system running for years.

Yes. Each pot's AQUAvalve5 controls water delivery independently, so a thirsty plant gets refilled more often than a light drinker. The nutrient concentration is shared across the reservoir, but at moderate EC levels (0.8 to 1.0) most strains handle the same feed without issues. If you're running strains with very different nutrient demands, you can use two smaller reservoirs instead of one large one and split your system into groups. Some growers also top-dress individual pots with strain-specific amendments while running a base solution in the shared reservoir.

If you receive a defective or damaged unit, email us a photo at help@happyhydro.com and we'll make it right immediately: replacement or refund, your call. For change-of-mind returns, we accept returns within 30 days for items in new, resalable condition. If you're not sure whether this product is right for your setup, call us first at 716-217-0353. We'd rather answer your questions before you order.

Happy Hydro has been selling growing equipment since 2006. We've carried AutoPot for years because the systems work great and customers who buy them leave happy. Have questions before you order? Call 716-217-0353 or email help@happyhydro.com. We're easy to reach and happy to help!